Terminal apparatus, base station apparatus, integrated circuit, and radio communication method

ABSTRACT

A terminal apparatus communicates with a base station apparatus. The terminal apparatus includes: a determination unit that determines the number of modulation symbols for channel state information transmitted on a physical uplink shared channel based on a value of an offset; and a transmission unit that transmits the channel state information to the base station apparatus on the physical uplink shared channel. When two subframe sets are configured by higher layers, the value of the offset is determined depending on the subframe set to which subframes for transmission on the physical uplink shared channel belong. Thus, the communication can be performed efficiently in a radio communication system in which the channel state information is used.

TECHNICAL FIELD

The present invention relates to a terminal apparatus, a base stationapparatus, an integrated circuit, and a radio communication method.

Priority is claimed on Japanese Patent Application No. 2013-150101,filed Jul. 19, 2013, the content of which is incorporated herein byreference.

BACKGROUND ART

Radio access schemes and radio networks (hereinafter referred to as along term evolution (LTE) or an evolved universal terrestrial radioaccess (EUTRA)) of cellular mobile communication have been examined inthe 3rd Generation Partnership Project (3GPP). In the LTE, a basestation apparatus is referred to as an evolved NodeB (eNodeB) and aterminal apparatus is referred to as user equipment (UE). The LTE is acellular communication system in which a plurality of areas covered bybase station apparatuses are arranged in cell forms. A single basestation apparatus may manage a plurality of cells.

The LTE corresponds to time division duplex (TDD). The LTE adopting aTDD scheme is referred to as a TD-LTE or LTE TDD. The TDD is atechnology for enabling full duplex communication at a signal frequencyband by performing time division multiplexing on an uplink signal and adownlink signal.

The 3GPP have examined that traffic adaptation technologies andinterference management and traffic adaptation (IMTA) technologies areapplied to the TD-LTE. A traffic adaption technology is a technology forchanging a ratio between an uplink resource and a downlink resourceaccording to an uplink traffic and a downlink traffic. The trafficadaptation technology is also referred to as a dynamic TDD.

In NPL 1, a method of using a flexible subframe is suggested as a methodof realizing traffic adaptation. A base station apparatus can receive anuplink signal or transmit a downlink signal in a flexible subframe. InNPL 1, a terminal apparatus regards a flexible subframe as a downlinksubframe unless the terminal apparatus receives an instruction totransmit an uplink signal in the flexible subframe from the base stationapparatus.

NPL 1 discloses that a hybrid automatic repeat request (HARQ) timingwith respect to a physical downlink shared channel (PDSCH) is determinedbased on newly introduced uplink-downlink configuration and an HARQtiming with respect to a physical uplink shared channel (PUSCH) isdetermined based on initial UL-DL configuration.

NPL 2 discloses that (a) UL/DL reference configuration is introduced and(b) one subframe can be scheduled for either of an uplink and a downlinkby dynamic grant/assignment from a scheduler.

In section 7.2 of NPL 3, an order of terminal apparatuses for reportingof channel state information (CSI) is described. A base stationapparatus allocates downlink resources to the terminal apparatuses basedon the channel state information reported from the plurality of terminalapparatuses. The channel state information includes a channel qualityindicator (CQI).

CITATION LIST Non-Patent Document

-   NPL 1: “on standardization impact of TDD UL-DL adaptation,”    R1-122016, Ericsson, ST-Ericsson, 3GPP TSG-RAN WG1 Meeting #69,    Prague, Czech Republic, 21 to 25 May 2012-   NPL 2: “Signallingsupport for dynamic TDD,” R1-130558, Ericsson,    ST-Ericsson, 3GPP TSG-RAN WG1 Meeting #72, St Julian's, Malta, 28    Jan. to 1 Feb. 2013-   NPL 3: “3GPP TS36. 213 v11.2.0 (2013-02),” February, 2013

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention

In the foregoing radio communication system, however, technologies forthe uplink control information have not been sufficiently examined. Thepresent invention is devised in view of the foregoing circumstance andan object of the present invention is to provide a terminal apparatus, abase station apparatus, a communication method, and an integratedcircuit capable of performing efficient communication in a radiocommunication system in which uplink control information is used.

Means for Solving the Problems

(1) To achieve the foregoing object, the present invention has contrivedthe following means. That is, according to an aspect of the presentinvention, there is provided a terminal apparatus which communicateswith a base station apparatus. The terminal apparatus includes: adetermination unit that determines the number of modulation symbols forchannel state information transmitted on a physical uplink sharedchannel based on a value of an offset; and a transmission unit thattransmits the channel state information to the base station apparatus onthe physical uplink shared channel. When two subframe sets areconfigured by higher layers, the value of the offset is determineddepending on the subframe set to which subframes for transmission on thephysical uplink shared channel belong.

(2) According to another aspect of the present invention, there isprovided a terminal apparatus which communicates with a base stationapparatus. The terminal apparatus includes: a configuration unit thatconfigures first and second subframe sets; a determination unit thatdetermines the number of modulation symbols for channel stateinformation transmitted on a physical uplink shared channel based on avalue of an offset; and a transmission unit that transmits the channelstate information to the base station apparatus on the physical uplinkshared channel. The determination unit configures a first value as thevalue of the offset, and configures a second value as the value of theoffset instead of the first value if a subframe for transmission on thephysical uplink shared channel belong to the second subframe set.

(3) In the terminal apparatus according to the aspect of the presentinvention, each of the first and second values may be configured basedon a signal of a higher layer.

(4) In the terminal apparatus according to the aspect of the presentinvention, the channel state information may be a CQI and a PMI.

(5) In the terminal apparatus according to the aspect of the presentinvention, the channel state information may be an RI.

(6) According to still another aspect of the present invention, there isprovided a base station apparatus which communicates with a terminalapparatus. The base station apparatus includes: a calculation unit thatcalculates the number of modulation symbols for channel stateinformation received on a physical uplink shared channel based on avalue of an offset; and a reception unit that receives the channel stateinformation from the terminal apparatus on the physical uplink sharedchannel. When two subframe sets are configured by higher layers, thevalue of the offset is based on the subframe set to which subframes forreception on the physical uplink shared channel belong.

(7) According to further still another aspect of the present invention,there is terminal apparatus which communicates with a base stationapparatus. The base station apparatus includes: a configuration unitthat configures first and second subframe sets; a calculation unit thatcalculates the number of modulation symbols for channel stateinformation received on a physical uplink shared channel based on avalue of an offset; and a reception unit that receives the channel stateinformation from the terminal apparatus on the physical uplink sharedchannel. The calculation unit configures a first value as the value ofthe offset, and configures a second value as the value of the offsetinstead of the first value if a subframe for reception on the physicaluplink shared channel belong to the second subframe set.

(8) In the base station apparatus according to the aspect of the presentinvention, each of the first and second values may be configured basedon a signal of a higher layer.

(9) In the base station apparatus according to the aspect of the presentinvention, the channel state information may be a CQI and a PMI.

(10) In the base station apparatus according to the aspect of thepresent invention, the channel state information may be an RI.

(11) According to further still another aspect of the present invention,there is provided an integrated circuit mounted on a terminal apparatuswhich communicates with a base station apparatus. The integrated circuitcauses the terminal apparatus to fulfill a series of functionsincluding: a function of determining the number of modulation symbolsfor channel state information transmitted on a physical uplink sharedchannel based on a value of an offset; and a function of transmittingthe channel state information to the base station apparatus on thephysical uplink shared channel. When two subframe sets are configured byhigher layers, the value of the offset is determined depending on thesubframe set to which subframes for transmission on the physical uplinkshared channel belong.

(12) According to further still another aspect of the present invention,there is provided an integrated circuit mounted on a terminal apparatuswhich communicates with a base station apparatus. The integrated circuitcauses the terminal apparatus to fulfill a series of functionsincluding: a function of configuring first and second subframe sets; afunction of determining the number of modulation symbols for channelstate information transmitted on a physical uplink shared channel basedon a value of an offset; and a function of transmitting the channelstate information to the base station apparatus on the physical uplinkshared channel A first value is configured as the value of the offset. Asecond value is configured as the value of the offset instead of thefirst value if a subframe for transmission on the physical uplink sharedchannel belong to the second subframe set.

(13) According to further still another aspect of the present invention,there is provided an integrated circuit mounted on a base stationapparatus which communicates with a terminal apparatus. The integratedcircuit causes the base station apparatus to fulfill a series offunctions including: a function of calculating the number of modulationsymbols for channel state information received on a physical uplinkshared channel based on a value of an offset; and a function ofreceiving the channel state information from the terminal apparatus onthe physical uplink shared channel. When two subframe sets areconfigured by higher layers, the value of the offset is based on thesubframe set to which subframes for reception on the physical uplinkshared channel belong.

(14) According to further still another aspect of the present invention,there is provided an integrated circuit mounted on a base stationapparatus which communicates with a terminal apparatus. The integratedcircuit causes the base station apparatus to fulfill a series offunctions including: a function of configuring first and second subframesets; a function of calculating the number of modulation symbols forchannel state information received on a physical uplink shared channelbased on a value of an offset; and a function of receiving the channelstate information from the terminal apparatus on the physical uplinkshared channel. A first value is configured as the value of the offset.A second value is configured as the value of the offset instead of thefirst value if a subframe for reception on the physical uplink sharedchannel belong to the second subframe set.

(15) According to further still another aspect of the present invention,there is provided a radio communication method used in a terminalapparatus which communicates with a base station apparatus. The radiocommunication method includes: determining the number of modulationsymbols for channel state information transmitted on a physical uplinkshared channel based on a value of an offset; and transmitting thechannel state information to the base station apparatus on the physicaluplink shared channel. When two subframe sets are configured by higherlayers, the value of the offset is determined depending on the subframeset to which subframes for transmission on the physical uplink sharedchannel belong.

(16) According to further still another aspect of the present invention,there is provided a radio communication method used in a terminalapparatus which communicates with a base station apparatus. The radiocommunication method includes: configuring first and second subframesets; determining the number of modulation symbols for channel stateinformation transmitted on a physical uplink shared channel based on avalue of an offset; transmitting the channel state information to thebase station apparatus on the physical uplink shared channel;configuring a first value as the value of the offset; and configuring asecond value as the value of the offset instead of the first value if asubframe for transmission on the physical uplink shared channel belongto the second subframe set.

(17) According to further still another aspect of the present invention,there is provided a radio communication method used in a base stationapparatus which communicates with a terminal apparatus. The radiocommunication method includes: calculating the number of modulationsymbols for channel state information received on a physical uplinkshared channel based on a value of an offset; and receiving the channelstate information from the terminal apparatus on the physical uplinkshared channel. When two subframe sets are configured by higher layers,the value of the offset is based on the subframe set to which subframesfor reception on the physical uplink shared channel belong.

(18) According to further still another aspect of the present invention,there is provided a radio communication method used in a base stationapparatus which communicates with a terminal apparatus. The radiocommunication method includes: configuring first and second subframesets; calculating the number of modulation symbols for channel stateinformation received on a physical uplink shared channel based on avalue of an offset; receiving the channel state information from theterminal apparatus on the physical uplink shared channel; configuring afirst value as the value of the offset; and configuring a second valueas the value of the offset instead of the first value if a subframe forreception on the physical uplink shared channel belong to the secondsubframe set.

Effects of the Invention

According to the aspects of the present invention, a terminal apparatusand a base station apparatus can efficiently communicate in a radiocommunication system in which channel state information is used.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a conceptual diagram illustrating a radio communication systemaccording to an embodiment.

FIG. 2 is a diagram illustrating an overall structure of a radio frameaccording to the embodiment.

FIG. 3 is a diagram illustrating the structure of a slot according tothe embodiment.

FIG. 4 is a diagram illustrating an example of arrangement of physicalchannels and physical signals in a downlink subframe according to theembodiment.

FIG. 5 is a diagram illustrating an example of arrangement of thephysical channels and the physical signals in an uplink subframeaccording to the embodiment.

FIG. 6 is a diagram illustrating an example of arrangement of thephysical channels and the physical signals in a special subframeaccording to the embodiment.

FIG. 7 is a table illustrating an example of uplink-downlinkconfiguration according to the embodiment.

FIG. 8 is a flowchart illustrating a method of setting uplink referenceUL-DL configuration and downlink reference UL-DL configuration accordingto the embodiment.

FIG. 9 is a diagram illustrating a relation between the subframeinstructed by the uplink reference UL-DL configuration and the subframeinstructed by the downlink reference UL-DL configuration according tothe embodiment.

FIG. 10 is a diagram illustrating a relation between the subframeinstructed by the uplink reference UL-DL configuration, the subframeinstructed by the downlink reference UL-DL configuration, and thesubframe instructed by transmission direction UL-DL configurationaccording to the embodiment.

FIG. 11 is a diagram illustrating a relation between the uplinkreference UL-DL configuration, the downlink reference UL-DLconfiguration, and the transmission direction UL-DL configurationaccording to the embodiment.

FIG. 12 is a diagram illustrating correspondence between subframe n inwhich PDCCH/EPDCCH/PHICH are arranged and subframe n+k in which PUSCHscorresponding to the PDCCH/EPDCCH/PHICH are arranged according to theembodiment.

FIG. 13 is a diagram illustrating correspondence between subframe n inwhich PHICH is arranged and subframe n-k in which PUSCH corresponding tothe PHICH is arranged according to the embodiment.

FIG. 14 is a diagram illustrating correspondence between subframe n inwhich PUSCH is arranged and subframe n+k in which PHICH corresponding tothe PUSCH is arranged according to the embodiment.

FIG. 15 is a diagram illustrating correspondence between subframe n-k inwhich PDSCH is arranged and subframe n in which HARQ-ACK correspondingto the PDSCH is transmitted according to the embodiment.

FIG. 16 is a table illustrating a modulation scheme and a coding ratecorresponding to a CQI index according to the embodiment.

FIG. 17 is a diagram illustrating examples of offsets corresponding tovalues of CSI request fields according to the embodiment.

FIG. 18 is a diagram illustrating examples of triggered aperiodic CSIsand offsets corresponding to the values of the CSI request fieldsaccording to the embodiment.

FIG. 19 is a schematic block diagram illustrating the structure of aterminal apparatus 1 according to the embodiment.

FIG. 20 is a schematic block diagram illustrating the structure of acoding unit 1071 according to the embodiment.

FIG. 21 is a schematic block diagram illustrating the structure of abase station apparatus 3 according to the embodiment.

FIG. 22 is a schematic block diagram illustrating the structure of adecoding unit 3051 according to the embodiment.

MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described.

In the embodiment, terminal apparatuses are configured in a plurality ofcells. A technology for enabling a terminal apparatus to performcommunication via a plurality of cells is referred to as cellaggregation or carrier aggregation. The present invention may also beapplied to each of the plurality of cells configured in the terminalapparatuses. The present invention may also be applied to some of theplurality of configured cells. A cell configured in a terminal apparatusis also referred to as a serving cell.

The plurality of configured serving cells include one primary cell andone or a plurality of secondary cells. The primary cell is a servingcell in which an initial connection establishment procedure isperformed, a serving cell in which a connection re-establishmentprocedure starts, or a cell which is instructed as a primary cell in ahandover procedure. When or after RRC connection is established, thesecondary cells may be configured.

A time division duplex (TDD) scheme is applied to a radio communicationsystem according to the embodiment. In the case of the cell aggregation,the TDD scheme may be applied to all of the plurality of cells. In thecase of the cell aggregation, cells to which the TDD scheme is appliedand cells to which a frequency division duplex (FDD) scheme is appliedmay be aggregated. When the cells to which the TDD is applied and thecells to which the FDD is applied are aggregated, the present inventioncan be applied to the cells to which the TDD is applied.

The terminal apparatus transmits information indicating combinations ofbands in which the carrier aggregation are supported by the terminalapparatus to a base station apparatus. The terminal apparatus transmits,to the base station apparatus, information indicating whethersimultaneous transmission and reception are supported in the pluralityof serving cells in a plurality of different bands in regard to each ofthe combinations of the bands.

In the embodiment, “X/Y” includes meanings of “X or Y.” In theembodiment, “X/Y” includes meanings of “X and Y.” In the embodiment,“X/Y” includes meanings of “X and/or Y.”

FIG. 1 is a conceptual diagram illustrating a radio communication systemaccording to an embodiment. In FIG. 1, the radio communication systemincludes terminal apparatuses 1A to 1C and a base station apparatus 3.Hereinafter, the terminal apparatuses 1A to 1C are referred to as theterminal apparatuses 1.

Physical channels and physical signals according to the embodiment willbe described.

In FIG. 1, the following uplink physical channels are used in uplinkradio communication from the terminal apparatus 1 to the base stationapparatus 3. The uplink physical channels are used to transmitinformation output from higher layers.

-   -   Physical Uplink Control Channel (PUCCH)    -   Physical Uplink Shared Channel (PUSCH)    -   Physical Random Access Channel (PRACH)

The PUCCH is a physical channel that is used to transmit uplink controlinformation (UCI). The uplink control information includes channel stateinformation (CSI) of a downlink, a scheduling request (SR) indicating arequest for a PUSCH resource, and acknowledgement (ACK)/negative ACK(NACK) to downlink data (TB: Transport block, DL-SCH: Downlink-SharedChannel). The ACK/NACK is referred to as HARQ-ACK, HARQ feedback, oracknowledgement information.

The PUSCH is a physical channel that is used to transmit an uplink data(UL-SCH: uplink-shared channel). The PUSCH may also be used to transmitHARQ-ACK and/or channel state information along with the uplink data.The PUSCH may be used to transmit only the channel state information oronly the HARQ-ACK and the channel state information.

The PRACH is a physical channel that is used to transmit a random accesspreamble. A main purpose of the PRACH is that the terminal apparatus 1takes time-domain synchronization with the base station apparatus 3.Further, the PRACH is also used to indicate an initial connectionestablishment procedure, a handover procedure, a connectionre-establishment procedure, synchronization (timing adjustment) foruplink transmission, and a request for PUSCH resources.

In FIG. 1, the following uplink physical signal is used in the uplinkradio communication. The uplink physical signal is not used to transmitinformation output from a higher layer, but is used in the physicallayer.

-   -   Uplink Reference Signal (UL RS)

In the embodiment, the following two types of uplink reference signalsare used.

-   -   Demodulation Reference Signal (DMRS)    -   Sounding Reference Signal (SRS)

The DMRS is associated with transmission of the PUSCH or the PUCCH. TheDMRS is subjected to time-domain multiplexing with the PUSCH or thePUCCH. The base station apparatus 3 uses the DMRS to perform channelcorrection of the PUSCH or the PUCCH. Hereinafter, transmission of bothof the PUSCH and the DMRS is simply referred to as transmission of thePUSCH. Hereinafter, transmission of both of the PUCCH and the DMRS issimply referred to as transmission of the PUCCH.

The SRS is not associated with the transmission of the PUSCH or thePUCCH. The base station apparatus 3 uses the SRS to measure an uplinkchannel state.

In FIG. 1, the following downlink physical channels are used in downlinkradio communication from the base station apparatus 3 to the terminalapparatus 1. The downlink physical channels are used to transmitinformation output from higher layers.

-   -   Physical Broadcast Channel (PBCH)    -   Physical Control Format Indicator Channel (PCFICH)    -   Physical Hybrid automatic repeat request Indictor Channel        (PHICH)    -   Physical Downlink Control Channel (PDCCH)    -   Enhanced Physical Downlink Control Channel (EPDCCH)    -   Physical Downlink Shared Channel (PDSCH)    -   Physical Multicast Channel (PMCH)

The PBCH is used to report a master information block (MIB, broadcastchannel: BCH) used commonly in the terminal apparatuses 1. The MIB istransmitted at intervals of 40 ms and the MIB is repeatedly transmittedat a period of 10 ms. Specifically, initial transmission of the MIB isperformed in subframe 0 of a radio frame satisfying SFN mod4=0 andretransmission (repetition) of the MIB is performed in subframe 0 of allof the other radio frames. A system frame number (SFN) is a radio framenumber. The MIB is system information. For example, the MIB includesinformation indicating the SFN.

The PCFICH is used to transmit information instructing a domain (OFDMsymbol) used to transmit the PDCCH.

The PHICH is used to transmit an HARQ indicator (HARQ feedback,acknowledgement information) indicating ACK (ACKnowledgement) or NACK(Negative ACKnowledgement) to uplink data (Uplink shared Channel:UL-SCH) received by the base station apparatus 3. For example, when theterminal apparatus 1 receives the HARQ indicator indicating ACK, thecorresponding uplink data is not retransmitted. For example, when theterminal apparatus 1 receives the HARQ indicator indicating NACK, thecorresponding uplink data is retransmitted. The single PHICH is used totransmit the HARQ indicator for single uplink data. The base stationapparatus 3 transmits the HARQ indicators for a plurality of pieces ofuplink data included in the same PUSCH using the plurality of PHICH.

The PDCCH and the EPDCCH are used to transmit downlink controlinformation (DCI). The downlink control information is referred to as aDCI format. The downlink control information includes downlink grant anduplink grant. The downlink grant is also referred to as downlinkassignment or downlink allocation.

The downlink grant is used for scheduling of the single PDSCH in asingle cell. The downlink grant is used for scheduling of the PDSCH inthe same subframe as a subframe in which the downlink grant istransmitted. The uplink grant is used for scheduling of the single PUSCHin a single cell. The uplink grant is used for scheduling of the singlePUSCH in a subframe located by four subframes later than a subframe inwhich the uplink grant is transmitted.

A cyclic redundancy check (CRC) parity bit is added to the DCI format.The CRC parity bit is scrambled with a cell-radio network temporaryidentifier (C-RNTI) or a semi-persistent scheduling cell-radio networktemporary identifier (SPS C-RNTI). The C-RNTI and the SPS C-RNTI areidentifiers used to identify a terminal apparatus in a cell.

The C-RNTI is used to control the PDSCH or the PUSCH in a singlesubframe. The SPS C-RNTI is used to periodically allocate the resourcesof the PDSCH or the PUSCH.

The PDSCH is used to transmit downlink data (downlink shared channel:DL-SCH).

The PMCH is used to transmit multicast data (Multicast Channel: MCH).

In FIG. 1, the following downlink physical signals are used in downlinkradio communication. The downlink physical signals are not used totransmit information output from higher layers, but are used in thephysical layer.

-   -   Synchronization Signal (SS)    -   Downlink Reference Signal (DL RS)

The synchronization signal is used for the terminal apparatus 1 tosynchronize a frequency domain and a time domain of a downlink. In theTDD scheme, synchronization signals are arranged in subframes 0, 1, 5,and 6 of a radio frame. In the FDD scheme, synchronization signals arearranged in subframes 0 and 5 of a radio frame.

The downlink reference signal is used for the terminal apparatus 1 tocorrect a channel of a downlink physical channel. The downlink referencesignal is used for the terminal apparatus 1 to calculate downlinkchannel state information. The downlink reference signal is used for theterminal apparatus 1 to measure a geographic location of the terminalapparatus 1.

In the embodiment, the following five types of downlink referencesignals are used.

-   -   Cell-specific Reference Signal (CRS)    -   URS (UE-specific Reference Signal) associated with PDSCH    -   Demodulation Reference Signal (DMRS) associated with EPDCCH    -   Non-Zero Power Channel State Information-Reference Signal (NZP        CSI-RS)    -   Zero Power Channel State Information-Reference Signal (ZP        CSI-RS)    -   Multimedia Broadcast and Multicast Service over Signal Frequency        Network Reference signal (MBSFN RS)    -   Positioning Reference Signal (PRS)

The CRS is transmitted with the entire band of a subframe. The CRS isused to demodulate the PBCH/PDCCH/PHICH/PCFICH/PDSCH. The CRS may beused for the terminal apparatus 1 to calculate the downlink channelstate information. The PBCH/PDCCH/PHICH/PCFICH is transmitted with anantenna port used for transmission of the CRS.

The URS associated with the PDSCH is transmitted with a subframe and aband used for transmission of the PDSCH with which the URS isassociated. The URS is used to demodulate the PDSCH with which the URSis associated.

The PDSCH is transmitted with an antenna port used for transmission ofthe CRS the URS. A DCI format 1A is used for scheduling of the PDSCHtransmitted with the antenna port used for transmission of the CRS. ADCI format 2D is used for scheduling of the PDSCH transmitted with theantenna port used for transmission of the URS.

The DMRS associated with the EPDCCH is transmitted with a subframe and aband used for transmission of the EPDCCH with which the DMRS isassociated. The DMRS is used to demodulate the EPDCCH with which theDMRS is associated. The EPDCCH is transmitted with an antenna port usedfor transmission of the DMRS.

The NZP CSI-RS is transmitted with a configured subframe. A resourcetransmitted by the NZP CSI-RS is configured by the base stationapparatus. The NZP CSI-RS is used for the terminal apparatus 1 tocalculate the downlink channel state information. The terminal apparatus1 performs signal measurement (channel measurement) using the NZPCSI-RS.

The resource of the ZP CSI-RS is configured by the base stationapparatus 3. The base station apparatus 3 transmits the ZP CSI-RS with azero output. That is, the base station apparatus 3 does not transmit theZP CSI-RS. The base station apparatus 3 does not transmit the PDSCH andthe EPDCCH in the configured resource of the ZP CSI-RS. For example, ina resource to which the NZP CSI-RS corresponds in a certain cell, theterminal apparatus 1 can measure interference.

The MBSFN RS is transmitted with the entire band of a subframe used fortransmission of the PMCH. The MBSFN RS is used to demodulate the PMCH.The PMCH is transmitted with an antenna port used for transmission ofthe MBSFN RS.

The PRS is used for the terminal apparatus to measure a geographiclocation of the terminal apparatus.

The downlink physical channels and the downlink physical signals arecollectively referred to as downlink signals. The uplink physicalchannels and the uplink physical signals are collectively referred to asuplink signals. The downlink physical channels and the uplink physicalchannels are collectively referred to as physical channels. The downlinkphysical signals and the uplink physical signals are collectivelyreferred to as physical signals.

The BCH, MCH, UL-SCH, and DL-SCH are transport channels. A channel usedin the Medium Access Control (MAC) layer is referred to as a transportchannel. Units of transport channels used in the MAC layer are referredto as a transport block (TB) or an MAC protocol data unit (PDU). In theMAC layer, control of Hybrid Automatic Repeat reQuest (HARQ) isperformed for each transport block. The transport block is units of datadelivered from the MAC layer to the physical layer. In the physicallayer, the transport block is mapped to a code word and a coding processis performed for each code word.

Hereinafter, the structure of a radio frame according to the embodimentwill be described.

FIG. 2 is a diagram illustrating an overall structure of a radio frameaccording to the embodiment. Each of the radio frames has a length of 10ms. In FIG. 2, the horizontal axis is a time axis. Each of the radioframes includes two half frames. Each of the half frames has a length of5 ms. Each of the half frames has five subframes. Each of the subframeshas a length of 1 ms and is defined by two contiguous slots. Each of theslots has a length of 0.5 ms. An i-th subframe in the radio frameincludes a (2×i)-th slot and a (2×i+1)-th slot. That is, ten subframescan be used at intervals of 10 ms.

In the embodiment, the following three types of subframes are defined.

-   -   Downlink Subframe (first subframe)    -   Uplink Subframe (second subframe)    -   Special Subframe (third subframe)

The downlink subframe is a subframe reserved for downlink transmission.The uplink subframe is a subframe reserved for uplink transmission. Thespecial subframe includes three fields. The three fields are a DownlinkPilot Time Slot (DwPTS), a Guard Period (GP), an Uplink Pilot Time Slot(UpPTS). A total length of the DwPTS, the GP, and the UpPTS is 1 ms. TheDwPTS is a field reserved for downlink transmission. The UpPTS is afield reserved for uplink transmission. The GP is a field for which thedownlink transmission and the uplink transmission are not performed. Thespecial subframe may include only the DwPTS and the GP or may includeonly the GP and the UpPTS.

A single radio frame includes at least a downlink subframe, an uplinksubframe, and a special subframe.

The radio communication system according to the embodiment supportsdownlink-to-uplink switch-point periodicity of 5 ms and 10 ms. When thedownlink-to-uplink switch-point periodicity is 5 ms, both of the halfframes of the radio frame include the special subframe. When thedownlink-to-uplink switch-point periodicity is 10 ms, only the firsthalf frame in the radio frame includes the special subframe.

Hereinafter, the structure of a slot according to the embodiment will bedescribed.

FIG. 3 is a diagram illustrating the structure of the slot according tothe embodiment. In the embodiment, a normal cyclic prefix (CP) isapplied to an OFDM symbol. An extended CP may also be applied to theOFDM symbol. A physical signal or a physical channel transmitted witheach slot is expressed by a resource grid. In FIG. 3, the horizontalaxis is a time axis and the vertical axis is a frequency axis. In adownlink, the resource grid is defined by a plurality of subcarriers anda plurality of OFDM symbols. In an uplink, the resource grid is definedby a plurality of subcarriers and a plurality of SC-FDMA symbols. Thenumber of subcarriers included in one slot depends on the bandwidth of acell. The number of OFDM symbols or SC-FDMA symbols included in one slotis 7. Each of elements in the resource grid is referred to as a resourceelement. The resource element is identified using a subcarrier numberand an OFDM symbol or SC-FDMA symbol number.

The resource block is used to express mapping to a resource element of acertain physical channel (PDSCH, PUSCH, or the like). In the resourceblock, a virtual resource block and a physical resource block aredefined. A certain physical channel is first mapped to a virtualresource block. Thereafter, the virtual resource block is mapped to aphysical resource block. One physical resource block is defined by 7contiguous OFDM symbols or SC-FDMA symbols in a time domain and 12contiguous subcarriers in a frequency domain. Therefore, one physicalresource block includes (7×12) resource elements. One physical resourceblock corresponds to one slot in the time domain and corresponds to 180kHz in the frequency domain. The physical resource block is numberedfrom 0 in the frequency domain.

Hereinafter, the physical channels and the physical signals transmittedin the subframes will be described.

FIG. 4 is a diagram illustrating an example of arrangement of thephysical channels and the physical signals in the downlink subframeaccording to the embodiment. In FIG. 4, the horizontal axis is a timeaxis and the vertical axis is a frequency axis. The base stationapparatus 3 may transmit the downlink physical channels (the PBCH, thePCFICH, the PHICH, the PDCCH, the EPDCCH, and the PDSCH) and thedownlink physical signals (the synchronization signal and the downlinkreference signal) in the downlink subframe. The PBCH is transmitted onlywith subframe 0 in the radio frame. The downlink reference signal isarranged in the resource elements dispersed in the frequency domain andthe time domain. To facilitate the description, the downlink referencesignal is not illustrated in FIG. 4.

In a PDCCH area, the plurality of PDCCHs may be subjected to frequencyand time multiplexing. In an EPDCCH area, the plurality of EPDCCHs maybe subjected to frequency, time, and space multiplexing. In a PDSCHarea, the plurality of PDSCHs may be subjected to frequency and spacemultiplexing. The PDCCH and the PDSCH or EPDCCH may be subjected to timemultiplexing. The PDSCH and the EPDCCH may be subjected to frequencymultiplexing.

FIG. 5 is a diagram illustrating an example of arrangement of thephysical channels and the physical signals in the uplink subframeaccording to the embodiment. In FIG. 5, the horizontal axis is a timeaxis and the vertical axis is a frequency axis. The terminal apparatus 1may transmit the uplink physical channels (the PUCCH, the PUSCH, and thePRACH) and the uplink physical signals (the DMRS and the SRS) in theuplink subframe. In a PUCCH area, the plurality of PUCCHs are subjectedto frequency, time, and code multiplexing. In a PUSCH area, theplurality of PUSCHs are subjected to frequency and space multiplexing.The PUCCH and the PUSCH may be subjected to frequency multiplexing. ThePRACHs may be arranged in a single subframe or two subframes. Theplurality of PRACHs may be subjected to code multiplexing.

The SRS is transmitted using the final SC-FDMA symbol in the uplinksubframe. That is, the SRS is arranged in the final SC-FDMA symbol inthe uplink subframe. The terminal apparatus 1 may not simultaneouslytransmit the SRS and the PUCCH/PUSCH/PRACH in the single SC-FDMA symbolof the single cell. In the single uplink subframe of the single cell,the terminal apparatus 1 can transmit the PUSCH and/or the PUCCH usingthe SC-FDMA symbols excluding the final SC-FDMA symbol in this uplinksubframe and can transmit the SRS using the final SC-FDMA symbol in thisuplink subframe. That is, the terminal apparatus 1 can transmit both ofthe SRS and the PUSCH/PUCCH in the single uplink subframe of the singlecell. The DMRS is subjected to time multiplexing along with the PUCCH orthe PUSCH. To simplify the description, the DMRS in FIG. 5 is notillustrated.

FIG. 6 is a diagram illustrating an example of arrangement of thephysical channels and the physical signals in a special subframeaccording to the embodiment. In FIG. 6, the horizontal axis is a timeaxis and the vertical axis is a frequency axis. In FIG. 6, the DwPTSincludes first to tenth SC-FDMA symbols in the special subframe, the GPincludes eleventh and twelfth SC-FDMA symbols in the special subframe,and the UpPTS includes thirteen and fourteen SC-FDMA symbols in thespecial subframe.

The base station apparatus 3 may transmit the PCFICH, the PHICH, thePDCCH, the EPDCCH, the PDSCH, the synchronization signal, and thedownlink reference signal in the DwPTS of the special subframe. The basestation apparatus 3 does not transmit the PBCH in the DwPTS of thespecial subframe. The terminal apparatus 1 may transmit the PRACH andthe SRS in the UpPTS of the special subframe. That is, the terminalapparatus 1 does not transmit the PUCCH, the PUSCH, and the DMRS in theUpPTS of the special subframe.

Hereinafter, uplink reference uplink-downlink (UL-DL) configuration,downlink reference uplink-downlink (UL-DL) configuration, andtransmission direction uplink-downlink (UL-DL) configuration will bedescribed.

The uplink reference UL-DL configuration, the downlink reference UL-DLconfiguration, and the transmission direction UL-DL configuration aredefined by uplink-downlink (UL-DL) configuration.

The uplink-downlink configuration is configuration related to a patternof the subframes in the radio frame. The uplink-downlink configurationindicates which subframe each of the subframes in the radio frame isamong the downlink subframe, the uplink subframe, and the specialsubframe.

That is, the uplink reference UL-DL configuration, the downlinkreference UL-DL configuration, and the transmission direction UL-DLconfiguration are defined by a pattern of the downlink subframe, theuplink subframe, and the special subframe in the radio frame.

The pattern of the downlink subframe, the uplink subframe, and thespecial subframe indicates that each of subframes #0 to #9 is one of thedownlink subframe, the uplink subframe, and the special subframe and ispreferably expressed by any combination with a length 10 of D, U, and S(respectively representing the downlink subframe, the uplink subframe,and the special subframe). More preferably, the head (that is, subframe#0) is D and the second subframe (that is, subframe #1) is S.

FIG. 7 is a table illustrating an example of uplink-downlinkconfiguration according to the embodiment. In FIG. 7, D represents thedownlink subframe, U represents the uplink subframe, and S representsthe special subframe.

In FIG. 7, subframe 1 in the radio frame is usually the specialsubframe. In FIG. 7, subframes 0 and 5 are usually reserved for downlinktransmission and subframe 2 is usually reserved for uplink transmission.

In FIG. 7, when the downlink-uplink switch-point periodicity is 5 ms,subframe 6 in the radio frame is the special subframe. When thedownlink-uplink switch-point periodicity is 10 ms, subframe 6 in theradio frame is the downlink subframe.

The uplink reference UL-DL configuration is also referred to as a firstparameter, first configuration, or serving cell uplink-downlinkconfiguration. The downlink reference UL-DL configuration is alsoreferred to as a second parameter or second configuration. Thetransmission direction UL-DL configuration is also referred to as athird parameter or third configuration.

Setting uplink-downlink configuration i as the uplink reference UL-DLconfiguration is referred to as setting uplink reference UL-DLconfiguration i. Setting uplink-downlink configuration i as the downlinkreference UL-DL configuration is referred to as setting downlinkreference UL-DL configuration i. Setting uplink-downlink configuration ias the transmission direction UL-DL configuration is referred to assetting transmission direction UL-DL configuration i.

Hereinafter, methods of setting the uplink reference UL-DLconfiguration, the downlink reference UL-DL configuration, and thetransmission direction UL-DL configuration will be described.

The base station apparatus 3 sets the uplink reference UL-DLconfiguration, the downlink reference UL-DL configuration, and thetransmission direction UL-DL configuration. The base station apparatus 3may transmit first information (TDD-Config) indicating the uplinkreference UL-DL configuration, second information indicating thedownlink reference UL-DL configuration, and third information indicatingthe transmission direction UL-DL configuration, by including the firstinformation, the second information, and the third information in atleast one of the MIB, a system information block type 1 message, asystem information message, an RRC message, an MAC control element (CE),and control information (for example, the DCI format) of the physicallayer. According to a circumstance, the base station apparatus 3 mayinclude the first information, the second information, and the thirdinformation in one of the MIB, the system information block type 1message, the system information message, the RRC message, the MACcontrol element (CE), and the control information (for example, the DCIformat) of the physical layer.

For each of the plurality of serving cells, the uplink reference UL-DLconfiguration, the downlink reference UL-DL configuration, and thetransmission direction UL-DL configuration may be defined.

The base station apparatus 3 transmits the first information, the secondinformation, and the third information regarding each serving cell tothe terminal apparatus 1 in which the plurality of serving cells areconfigured. For each serving cell, the first information, the secondinformation, and the third information may be defined.

The base station apparatus 3 may transmit the first informationregarding a primary cell, the second information regarding the primarycell, the third information regarding the primary cell, the firstinformation regarding a secondary cell, the second information regardingthe secondary cell, and the third information regarding the secondarycell to the terminal apparatus 1 in which the two serving cellsincluding one primary cell and one secondary cell are configured.

The terminal apparatus 1 in which the plurality of serving cells areconfigured may set the uplink reference UL-DL configuration, thedownlink reference UL-DL configuration, and the transmission directionUL-DL configuration in each serving cell based on the first information,the second information, and the third information.

The terminal apparatus 1 in which two serving cells including oneprimary cell and one secondary cell are configured may set the uplinkreference UL-DL configuration regarding the primary cell, the downlinkreference UL-DL configuration regarding the primary cell, thetransmission direction UL-DL configuration regarding the primary cell,the uplink reference UL-DL configuration regarding the secondary cell,the downlink reference UL-DL configuration regarding the secondary cell,and the transmission direction UL-DL configuration regarding thesecondary cell.

The first information regarding the primary cell is preferably includedin the system information block type 1 message or the RRC message. Thefirst information regarding the secondary cell is preferably included inthe RRC message. The second information regarding the primary cell ispreferably included in the system information block type 1 message, thesystem information message, or the RRC message. The second informationregarding the secondary cell is preferably included in the RRC message.The third information is preferably included in the control information(for example, the DCI format) of the physical layer.

The first information is preferably common to the plurality of terminalapparatuses 1 in the cell. The second information may be common to theplurality of terminal apparatuses 1 in the cell or may be dedicated forthe terminal apparatus 1. The third information may be common to theplurality of terminal apparatuses 1 in the cell or may be dedicated forthe terminal apparatus 1.

The system information block type 1 message is initially transmitted insubframe 5 of the radio frame satisfying SFN mod8=0 via the PDSCH and isretransmitted (repeated) in subframe 5 of another radio frame satisfyingSFN mod2=0. The system information block type 1 message includesinformation indicating the structure (the length of the DwPTS, the GP,and the UpPTS) of the special subframe. The system information blocktype 1 message is cell-unique information.

The system information message is transmitted via the PDSCH. The systeminformation message is cell-unique information. The system informationmessage includes system information block X other than systeminformation block type 1.

The RRC message is transmitted via the PDSCH. The RRC message isinformation/signal processed in an RRC layer. The RRC message may becommon to the plurality of terminal apparatuses 1 in the cell or may bededicated for the specific terminal apparatus 1.

The MAC CE is transmitted via the PDSCH. The MAC CE isinformation/signal processed in the MAC layer.

FIG. 8 is a flowchart illustrating a method of setting the uplinkreference UL-DL configuration and the downlink reference UL-DLconfiguration according to the embodiment. The terminal apparatus 1performs the setting method in FIG. 8 on each of the plurality ofserving cells.

The terminal apparatus 1 sets the uplink reference UL-DL configurationbased on the first information in a certain serving cell (S1000). Theterminal apparatus 1 determines whether the second information regardingthe certain serving cell is received (S1002). If the terminal apparatus1 receives the second information regarding the certain serving cell,the terminal apparatus 1 sets downlink reference UL-DL configurationbased on the second information regarding the certain serving cell inthe certain serving cell (S1006). If the terminal apparatus 1 does notreceive the second information regarding the certain serving cell(else/otherwise), the terminal apparatus 1 sets the downlink referenceUL-DL configuration based on the first information regarding the certainserving cell in the certain serving cell (S1004).

The serving cell in which the uplink reference UL-DL configuration andthe downlink reference UL-DL configuration are set based on the firstinformation is also referred to as a serving cell in which no dynamicTDD is configured. The serving cell in which the downlink referenceUL-DL configuration is set based on the second information is alsoreferred to as a serving cell in which the dynamic TDD is configured.

The terminal apparatus 1 receives the second information and determinesthe subframe in which the uplink signal can be transmitted based on thesecond information. Next, the terminal apparatus 1 monitors the thirdinformation. When the terminal apparatus 1 receives the thirdinformation, the terminal apparatus 1 determines the subframe in whichthe uplink signal can be transmitted based on the third information.

Hereinafter, the uplink reference UL-DL configuration will be described.

The uplink reference UL-DL configuration is used in the serving cell atleast to specify the subframe for which the uplink transmission ispossible or not possible.

The terminal apparatus 1 does not perform the uplink transmission in thesubframe instructed as the downlink subframe by the uplink referenceUL-DL configuration. The terminal apparatus 1 does not perform theuplink transmission in the DwPTS and the GP of the subframe instructedas the special subframe by the uplink reference UL-DL configuration.

Hereinafter, the downlink reference UL-DL configuration will bedescribed.

The downlink reference UL-DL configuration is used in the serving cellat least to specify the subframe for which the downlink transmission ispossible or not possible.

The terminal apparatus 1 does not perform the downlink transmission inthe subframe instructed as the uplink subframe by the downlink referenceUL-DL configuration. The terminal apparatus 1 does not perform thedownlink transmission in the UpPTS and the GP of the subframe instructedas the special subframe by the downlink reference UL-DL configuration.

The terminal apparatus 1 setting the downlink reference UL-DLconfiguration based on the first information may perform measurement(for example, measurement related to the channel state information)using the downlink signal in the DwPTS of the special subframe or thedownlink subframe instructed by the uplink reference UL-DL configurationor the downlink reference UL-DL configuration.

The base station apparatus 3 determines the downlink reference UL-DLconfiguration in a set (configuration of a set) of the configurationsrestricted based on the uplink reference UL-DL configuration. That is,the downlink reference UL-DL configuration is an element of theconfiguration set restricted based on the uplink reference UL-DLconfiguration. The configuration set restricted based on the uplinkreference UL-DL configuration includes uplink-downlink configurationsatisfying conditions (a) to (c) of FIG. 9. FIG. 9 is a diagramillustrating a relation between the subframe instructed by the uplinkreference UL-DL configuration and the subframe instructed by thedownlink reference UL-DL configuration according to the embodiment. InFIG. 9, D indicates a downlink subframe, U indicates an uplink subframe,and S indicates a special subframe.

Thus, since the use of the uplink transmission of the DwPTS of thespecial subframe and the subframe instructed as the downlink subframe bythe uplink reference UL-DL configuration is not made in the dynamic TDD,the terminal apparatus 1 setting the downlink reference UL-DLconfiguration based on the first information can appropriately performmeasurement using the downlink signal.

The terminal apparatus 1 setting the downlink reference UL-DLconfiguration based on the second information may also performmeasurement (for example, measurement related to the channel stateinformation) using the downlink signal in the DwPTS of the specialsubframe or the downlink subframe instructed by the uplink referenceUL-DL configuration.

The subframe instructed as the uplink subframe by the uplink referenceUL-DL configuration and instructed as the downlink subframe by thedownlink reference UL-DL configuration is also referred to as a firstflexible subframe. The first flexible subframe is a subframe that isreserved for uplink and downlink transmission.

The subframe instructed as the special subframe by the uplink referenceUL-DL configuration and instructed as the downlink subframe by thedownlink reference UL-DL configuration is also referred to as a secondflexible subframe. The second flexible subframe is a subframe that isreserved for downlink transmission. The second flexible subframe is asubframe that is reserved for downlink transmission in the DwPTS anduplink transmission in the UpPTS.

Hereinafter, the transmission direction UL-DL configuration will bedescribed in detail.

The terminal apparatus 1 and the base station apparatus 3 set thetransmission direction UL-DL configuration related to transmissiondirections (up/down) in the subframe. The transmission direction UL-DLconfiguration is used to determine the transmission direction in thesubframe.

The terminal apparatus 1 controls the transmission of the first flexiblesubframe and the second flexible subframe based on schedulinginformation (the DCI format and/or the HARQ-ACK) and the transmissiondirection UL-DL configuration.

The base station apparatus 3 transmits the third information indicatingthe transmission direction UL-DL configuration to the terminal apparatus1. The third information is information that instructs the subframe forwhich the uplink transmission is possible. The third information isinformation that instructs the subframe for which the downlinktransmission is possible. The third information is information thatinstructs the subframe for which the uplink transmission in the UpPTSand the downlink transmission in the DwPTS are possible.

For example, the transmission direction UL-DL configuration is used tospecify a transmission direction of the subframe which is instructed asthe uplink subframe by the uplink reference UL-DL configuration and isinstructed as the downlink subframe by the downlink reference UL-DLconfiguration and/or the subframe which is instructed as the specialsubframe by the uplink reference UL-DL configuration and is instructedas the downlink subframe by the downlink reference UL-DL configuration.That is, the transmission direction UL-DL configuration is used tospecify the transmission direction of the subframe instructed as thesubframe different in the uplink reference UL-DL configuration and thedownlink reference UL-DL configuration.

FIG. 10 is a diagram illustrating a relation between the subframeinstructed by the uplink reference UL-DL configuration, the subframeinstructed by the downlink reference UL-DL configuration, and thesubframe instructed by the transmission direction UL-DL configurationaccording to the embodiment. In FIG. 10, D indicates the downlinksubframe, U indicates the uplink subframe, and S indicates the specialsubframe.

The base station apparatus 3 determines the transmission direction UL-DLconfiguration in a configuration set (configuration of a set) restrictedbased on the uplink reference UL-DL configuration and the downlinkreference UL-DL configuration. That is, the transmission direction UL-DLconfiguration is an element in the configuration set restricted based onthe uplink reference UL-DL configuration and the downlink referenceUL-DL configuration. The configuration set restricted based on theuplink reference UL-DL configuration and the downlink reference UL-DLconfiguration includes uplink-downlink configuration that satisfiesconditions (d) to (h) of FIG. 10.

The base station apparatus 3 may perform scheduling of the downlinktransmission in the subframe instructed as the downlink subframe by thetransmission direction UL-DL configuration.

The terminal apparatus 1 may perform a process of receiving the downlinksignal in the subframe instructed as the downlink subframe by thetransmission direction UL-DL configuration. The terminal apparatus 1 maymonitor the PDCCH/EPDCCH in the subframe instructed as the downlinksubframe by the transmission direction UL-DL configuration. The terminalapparatus 1 may perform a process of receiving the PDSCH in the subframeinstructed as the downlink subframe by the transmission direction UL-DLconfiguration based on the detection of the downlink grant via thePDCCH/EPDCCH.

When transmission of the uplink signal (PUSCH/SRS) in the subframeinstructed as the downlink subframe by the transmission direction UL-DLconfiguration is scheduled or configured, the terminal apparatus 1 doesnot perform a process of transmitting the uplink signal (PUSCH/SRS) inthe subframe.

The base station apparatus 3 may schedule the uplink transmission in thesubframe instructed as the uplink subframe by the transmission directionUL-DL configuration.

The base station apparatus 3 may schedule the downlink transmission inthe subframe instructed as the uplink subframe by the transmissiondirection UL-DL configuration. The scheduling of the downlinktransmission by the base station apparatus 3 may be prohibited in thesubframe instructed as the uplink subframe by the transmission directionUL-DL configuration.

The terminal apparatus 1 may perform a process of transmitting theuplink signal in the subframe instructed as the uplink subframe by thetransmission direction UL-DL configuration. When transmission of theuplink signal (PUSCH/DMRS/SRS) in the subframe instructed as the uplinksubframe by the transmission direction UL-DL configuration is scheduledor configured, the terminal apparatus 1 may perform a process oftransmitting the uplink signal (PUSCH/DMRS/SRS) in the subframe.

The terminal apparatus 1 may perform a process of receiving the downlinksignal in the subframe which is instructed as the uplink subframe by thetransmission direction UL-DL configuration and for which the uplinktransmission is not scheduled. The process of receiving the downlinksignal by the terminal apparatus 1 may be prohibited in the subframeinstructed as the uplink subframe by the transmission direction UL-DLconfiguration.

The base station apparatus 3 may schedule the downlink transmission inthe DwPTS of the subframe instructed as the special subframe by thetransmission direction UL-DL configuration.

The terminal apparatus 1 may perform a process of receiving the downlinksignal in the DwPTS of the subframe instructed as the special subframeby the transmission direction UL-DL configuration. The terminalapparatus 1 may monitor the PDCCH/EPDCCH in the DwPTS of the subframeinstructed as the special subframe by the transmission direction UL-DLconfiguration. The terminal apparatus 1 may perform a process ofreceiving the PDSCH in the DwPTS of the subframe instructed as thespecial subframe by the transmission direction UL-DL configuration basedon the detection of the downlink grant via the PDCCH/EPDCCH.

When the transmission of the PUSCH in the subframe instructed as thespecial subframe by the transmission direction UL-DL configuration isscheduled or configured, the terminal apparatus 1 does not perform theprocess of transmitting the PUSCH in the subframe.

When the transmission of the SRS in the UpPTS of the subframe instructedas the special subframe by the transmission direction UL-DLconfiguration is scheduled or configured, the terminal apparatus 1 mayperform a process of transmitting the SRS in the UpPTS of the subframe.

FIG. 11 is a diagram illustrating a relation between the uplinkreference UL-DL configuration, the downlink reference UL-DLconfiguration, and the transmission direction UL-DL configurationaccording to the embodiment.

For example, when the uplink reference UL-DL configuration is 0 in FIG.11, the downlink reference UL-DL configuration is one of a set downlinkreference UL-DL configuration {0, 1, 2, 3, 4, 5, 6}. For example, whenthe uplink reference UL-DL configuration is 1 in FIG. 11, the downlinkreference UL-DL configuration is one of a set downlink reference UL-DLconfiguration {1, 2, 4, 5}.

For example, when the uplink reference UL-DL configuration is 0 and thedownlink reference UL-DL configuration is 1 in FIG. 11, the transmissiondirection UL-DL configuration is one of a set {0, 1, 6}.

The value of the downlink reference UL-DL configuration may be the sameas the value of the uplink reference UL-DL configuration. However, thevalue of the downlink reference UL-DL configuration indicated by thesecond information is preferably not the same as the value of the uplinkreference UL-DL configuration indicated by the first information inorder that the terminal apparatus 1 not receiving the second informationsets the same value as the value of the uplink reference UL-DLconfiguration as the downlink reference UL-DL configuration.

When the value of the uplink reference UL-DL configuration is the sameas the value of the downlink reference UL-DL configuration, thetransmission direction UL-DL configuration may not be defined. When thevalue of the uplink reference UL-DL configuration is the same as thevalue of the downlink reference UL-DL configuration, the same value asthe value of the uplink reference UL-DL configuration and the value ofthe downlink reference UL-DL configuration may be set in thetransmission direction UL-DL configuration.

Hereinafter, the uplink HARQ timing will be described in detail.

The uplink reference UL-DL configuration is used to specify (select ordetermine) correspondence between subframe n in which thePDCCH/EPDCCH/PHICH are arranged and subframe n+k in which the PUSCHscorresponding to the PDCCH/EPDCCH/PHICH are arranged.

FIG. 12 is a diagram illustrating correspondence between subframe n inwhich PDCCH/EPDCCH/PHICH are arranged and subframe n+k in which thePUSCHs corresponding to the PDCCH/EPDCCH/PHICH are arranged according tothe embodiment. The terminal apparatus 1 specifies (selects ordetermines) the value of k with reference to the table of FIG. 12.Hereinafter, in the description of FIG. 12, the uplink reference UL-DLconfiguration is simply referred to as the uplink-downlinkconfiguration.

When the terminal apparatus 1 detects the PDCCH/EPDCCH accompanying theuplink grant which targets the terminal apparatus 1 in subframe n incorrespondence with the serving cell in which uplink-downlinkconfigurations 1 to 6 are set, the terminal apparatus 1 transmits thePUSCH according to the uplink grant in subframe n+k specified (selectedor determined) based on the table of FIG. 12.

When the terminal apparatus 1 detects the PHICH accompanying the NACKthat targets the terminal apparatus 1 in subframe n in correspondencewith the serving cell in which uplink-downlink configurations 1 to 6 areset, the terminal apparatus 1 transmits the PUSCH in subframe n+kspecified (selected or determined) based on the table of FIG. 12.

The uplink grant that targets the terminal apparatus 1 includes a 2-bituplink index (ULindex) in correspondence with the serving cell in whichuplink-downlink configuration 0 is set. The uplink grant that targetsthe terminal apparatus 1 does not include the uplink index (ULindex) incorrespondence with the serving cell in which uplink-downlinkconfigurations 1 to 6 are set.

When 1 is set as the most significant bit (MSB) of the uplink indexincluded in the uplink grant corresponding to the serving cell in whichuplink-downlink configuration 0 is set in subframe n, the terminalapparatus 1 adjusts the transmission of the PUSCH according to theuplink grant in subframe n+k specified (selected or determined) based onthe table of FIG. 12.

When the PHICH accompanying the NACK corresponding to the serving cellin which uplink-downlink configuration 0 is set is received in a firstresource set in subframe n=0 or 5, the terminal apparatus 1 adjusts thetransmission of the PUSCH according to the PHICH in subframe n+kspecified (selected or determined) based on the table of FIG. 12.

When 1 is set as the least significant bit (LSB) of the uplink indexincluded in the uplink grant corresponding to the serving cell in whichthe uplink-downlink configuration 0 is set in subframe n, the terminalapparatus 1 adjusts the transmission of the PUSCH according to theuplink grant in subframe n+7.

When the PHICH accompanying the NACK corresponding to the serving cellin which uplink-downlink configuration 0 is set is received in a secondresource set in subframe n=0 or 5, the terminal apparatus 1 adjusts thetransmission of the PUSCH according to the uplink grant in subframe n+7.

When the PHICH accompanying the NACK corresponding to the serving cellin which the uplink-downlink configuration 0 is set is received insubframe n=1 or 6, the terminal apparatus 1 adjusts the transmission ofthe PUSCH according to the uplink grant in subframe n+7.

For example, when the terminal apparatus 1 detects thePDCCH/EPDCCH/PHICH corresponding to the serving cell in which theuplink-downlink configuration 0 is set in [SFN=m, subframe 1], theterminal apparatus 1 adjusts the transmission of the PUSCH in thesubframe [SFN=m, subframe 7] located later by six subframes.

The uplink reference UL-DL configuration is used to specify (select ordetermine) correspondence between subframe n in which the PHICH isarranged and subframe n-k in which the PUSCH corresponding to the PHICHis arranged.

FIG. 13 is a diagram illustrating correspondence between subframe n inwhich the PHICH is arranged and subframe n-k in which the PUSCHcorresponding to the PHICH is arranged according to the embodiment. Theterminal apparatus 1 specifies (selects or determines) the value of kaccording to the table of FIG. 13. Hereinafter, in the description ofFIG. 13, the uplink reference UL-DL configuration is simply referred toas the uplink-downlink configuration.

For the serving cell in which uplink-downlink configurations 1 to 6 areset, the HARQ indicator (HARQ-ACK) received via the PHICH correspondingto this serving cell in subframe n is associated with the transmissionof the PUSCH in subframe n-k specified based on the table of FIG. 13.

For the serving cell in which uplink-downlink configuration 0 is set,the first resource set in subframe n=0 or 5 or the HARQ indicator(HARQ-ACK) received via the PHICH corresponding to the serving cell insubframe n=1 or 6 is associated with the transmission of the PUSCH insubframe n-k specified based on the table of FIG. 13.

For the serving cell in which uplink-downlink configuration 0 is set,the HARQ indicator (HARQ-ACK) received via the PHICH corresponding tothe serving cell in the second resource set in subframe n=0 or 5 isassociated with the transmission of the PUSCH in subframe n−6.

For example, for the serving cell in which uplink-downlink configuration1 is set, the HARQ indicator (HARQ-ACK) received via the PHICH in[SFN=m, subframe 1] is associated with the transmission of the PUSCH inthe subframe [SFN=m−1, subframe 7] located earlier by 4 subframes.

The uplink reference UL-DL configuration is used to specify (select ordetermine) correspondence between subframe n in which the PUSCH isarranged and subframe n+k in which the PHICH corresponding to the PUSCHis arranged.

FIG. 14 is a diagram illustrating correspondence between subframe n inwhich the PUSCH is arranged and subframe n+k in which the PHICHcorresponding to the PUSCH is arranged according to the embodiment. Theterminal apparatus 1 specifies (selects or determines) the value of kaccording to the table of FIG. 14. Hereinafter, in the description ofFIG. 14, the uplink reference UL-DL configuration is simply referred toas the uplink-downlink configuration.

When the transmission of the PUSCH in subframe n is scheduled, theterminal apparatus 1 determines a PHICH resource in subframe n+kspecified from the table of FIG. 14.

For example, when the transmission of the PUSCH in [SFN=m, subframe n=2]is scheduled for the serving cell in which uplink-downlink configuration0 is set, the PHICH resource is determined in [SFN=m, subframe n=6].

Hereinafter, a downlink HARQ timing will be described in detail.

The downlink reference UL-DL configuration is used to specify (select ordetermine) correspondence between subframe n in which the PDSCH isarranged and subframe n+k in which the HARQ-ACK corresponding to thePDSCH is transmitted.

FIG. 15 is a diagram illustrating correspondence between subframe n-k inwhich the PDSCH is arranged and subframe n in which the HARQ-ACKcorresponding to the PDSCH is transmitted according to the embodiment.The terminal apparatus 1 specifies (selects or determines) the value ofk with reference to the table of FIG. 15. Hereinafter, in thedescription of FIG. 15, the downlink reference UL-DL configuration issimply referred to as the uplink-downlink configuration.

When the terminal apparatus 1 is a target in subframe n-k (where k isspecified by the table of FIG. 15) of the serving cell and thetransmission of the PDSCH in which the corresponding HARQ-ACK is to betransmitted is detected, the terminal apparatus 1 transmits the HARQ-ACKin subframe n.

For example, the terminal apparatus 1 makes no response of the HARQ-ACKto the transmission of the PDSCH used for transmission of the systeminformation. For example, the terminal apparatus 1 makes response of theHARQ-ACK to the transmission of the PDSCH scheduled by the DCI formataccompanying the CRC scrambled with the C-RNTI.

For example, the terminal apparatus 1 transmits the HARQ-ACK withsubframe n=2 in response to the PDSCH received in subframe n−6 and/orn−7 in the serving cell in which uplink-downlink configuration 1 is set.

For the serving cell for which the second information is not received,the downlink reference UL-DL configuration may not be defined. In thiscase, based on the uplink reference UL-DL configuration (serving cellUL-DL configuration), the terminal apparatus 1 and the base stationapparatus 3 may perform a process performed based on the above-describeddownlink reference UL-DL configuration. The serving cell for which thesecond information is not received is a serving cell in which thedynamic TDD is not set.

Hereinafter, CSI reporting (report) according to the present inventionwill be described. Here, a case in which at least two subframe sets areconfigured in the uplink for performing the CSI reporting is assumed.

Information transmittable with the CSI includes a channel qualityindicator (CQI), a rank indicator (RI), a precoding matrix indicator(PMI), and a precoding type indicator (PTI). The CQI expresses acombination of a modulation scheme and a coding rate for a singletransport block transmitted with the PDSCH. The coding rate is derivedfrom a resource amount of the PDSCH and a transport block size.

FIG. 16 is a table illustrating examples of a modulation scheme and acoding rate corresponding to a CQI index according to the embodiment.The terminal apparatus 1 derives the CQI index which is transmitted by adownlink physical resource block group called a CSI reference resource,satisfies a condition that a single PDSCH transport block which is acombination of the modulation scheme and the transport block sizecorresponding to the CQI index may be received at a transport blockerror probability not exceeding 0.1, and has the highest value among 1to 15 in the table of FIG. 16. When CQI index 1 does not satisfy theforegoing condition, the terminal apparatus 1 derives CQI index 0. Thederived CSI is reported to the base station apparatus 3 by using thePUCCH or the PUSCH through periodic CSI reporting or aperiodic CSIreporting.

Hereinafter, the aperiodic CSI reporting according to the invention willbe described.

The aperiodic CSI is transmitted on the PUSCH. When the uplink grant fora serving cell c in subframe n is detected and the CSI report is set tobe triggered in the CSI request field included in the uplink grant, theterminal apparatus 1 performs the aperiodic CSI report using the PUSCHscheduled by the uplink grant in subframe n+k in the serving cell c.Here, k is based on a correspondence relation between subframe n inwhich the PDCCH/EPDCCH/PHICH illustrated in FIG. 12 is arranged andsubframe n+k in which the PUSCHs corresponding to the PDCCH/EPDCCH/PHICHare arranged. However, when transmission of uplink data of the PUSCH inthe uplink grant is not instructed, the terminal apparatus 1 cantransmit the aperiodic CSI without being associated with the uplink dataon the PUSCH.

In the CSI request field, information (CSI request) indicating whetherthe aperiodic CSI report is instructed to the terminal apparatus 1 ismapped. The information indicates the CSI process and/or the subframeset. The terminal apparatus 1 may report the aperiodic CSI in regard tothe CSI process and/or the subframe set indicated by the information.

The terminal apparatus 1 derives a wideband CQI and a subband CQI. Inthe frequency domain, the wideband CQI corresponds to all of thedownlink physical resource blocks and the subband CQI corresponds tosome of the downlink physical resource blocks.

Hereinafter, the CSI reference resource will be described.

In the frequency domain, the CSI reference resource is defined by agroup of the downlink physical resource blocks corresponding to bandswith which the derived values of the CQI are associated.

In the time domain, the CSI reference resource is defined by onesubframe. When the CSI is reported in subframe n, the CSI referenceresource is defined by subframe n-n_(cQIref).

For example, when the CSI is reported in subframe n, n_(cQIref) is thesmallest value which corresponds to the subframe in which the subframen-n_(cQIref) is effective and which is greater than m or is equal to m.For example, m is 4 or 5. For example, when the aperiodic CSI isreported, the CSI reference resource is an effective subframe in whichthe corresponding CSI request is received.

When the transmission of the uplink data transmitted together on thePUSCH is initial transmission or retransmission and is retransmission, amethod of calculating the number Q′ of modulation symbols (modulationcoded symbols) used for transmission of CQI and/or PMI (hereinafterreferred to as CQI/PMI) in the information transmitted through the CSIreporting is different according to a combination of the classificationof the subframe set used in the initial transmission and the subframeset used in the current transmission.

When the uplink data is initially transmitted along with the CQI/PMI orthe uplink data is retransmitted along with the CQI/PMI and when thesubframe set (the subframe set to which the initially transmittedsubframes belong) used for the initial transmission of the uplink datais the same as the subframe set (the subframe set to which theretransmitted subframes belong) used for the current retransmission ofthe uplink data, the number Q′ of modulation symbols is calculated usingExpression 1 of the following expression.

$\begin{matrix}{Q^{\prime} = {\min\begin{pmatrix}{\left\lceil \frac{\left( {O + L} \right) \cdot M_{sc}^{{PUSCH} - {{initial}{(x)}}} \cdot N_{symb}^{{PUSCH} - {{initial}{(x)}}} \cdot \beta_{offset}^{PUSCH}}{\sum\limits_{r = 0}^{C^{(x)} - 1}\; K_{r}^{(x)}} \right\rceil,} \\{{M_{sc}^{PUSCH} \cdot N_{symb}^{PUSCH}} - \frac{Q_{RI}^{(x)}}{Q_{m}^{(x)}}}\end{pmatrix}}} & \left\lbrack {{Math}.\mspace{11mu} 1} \right\rbrack\end{matrix}$

Here, min(·) is a function of selecting the minimum number in theparentheses. O is the number of bits of the CQI/PMI input from a higherlayer and L is a value of the CRC bit based on the value of 0. Forexample, L is configured to 0 when O is equal to or less than 11. L isconfigured to 8 when L is equal to or greater than 12. Further, x is anindex of uplink data in which an index I_(MCS) of MCS indicated with theuplink grant for the initial transmission of the uplink data is thehighest among the uplink data transmitted on the PUSCH along with theCQI/PMI when the plurality of pieces of uplink data are simultaneouslytransmitted. The uplink data is also referred to as uplink data x or issimply referred to as uplink data. Here, x=1 when the same value of theI_(MCS) is indicated by the uplink grants for two pieces of uplink data.M^(PUSCH-initial(x))SC indicates a bandwidth scheduled for the initialtransmission of the PUSCH of the uplink data x transmitted on the PUSCHalong with the CQI/PMI and is expressed by the number of subcarriers.N^(PUSCH-initial(x)) _(symb) indicates the number of SC-FDMA symbols inthe subframe for the initial transmission of the PUSCH of the uplinkdata x transmitted on the PUSCH along with the CQI/PMI. K^((x)) _(r)indicates a sum of a payload size A of the uplink data x transmitted onthe PUSCH and the sequence length of a cyclic redundancy check codeadded to the uplink data. M^(PUSCH)sc indicates the bandwidth scheduledfor transmission of the PUSCH in the current subframe for the uplinkdata transmitted on the PUSCH along with the CQI and is expressed by thenumber of subcarriers. N^(PUSCH) _(symb) indicates the number of SC-FDMAsymbols in the current subframe for the transmission on the PUSCH of theuplink data transmitted on the PUSCH along with the CQI/PMI. Q^((x))_(RI) indicates the number of modulation symbols used for transmissionof RI. Q^((x)) _(m) is a modulation level used for modulation of theCQI/PMI and the RI.

Here, β^(PUSCH) _(offset) is an offset value which is configured foreach terminal apparatus 1 by the base station apparatus 3 and isconfigured using a radio resource control signal (RRC signal) of whichthe base station apparatus 3 notifies the terminal apparatus 1. Here,the RRC signal is also referred to as an RRC message, RRC informationelements, or a higher layer signal (higher layer signaling). Theterminal apparatus 1 calculates Q′ by applying the configured β^(PUSCH)_(offset) to Expression 1. That is, the number of modulation symbolsused for transmission of the CQI/PMI is determined by β^(PUSCH)_(offset). That is, a coding rate of the CQI/PMI is determined byβ^(PUSCH) _(offset) (the modulation and the coding scheme of the CQI/PMImay be determined). However, when β^(PUSCH) _(offset) is not configuredby the RRC signal, a predefined value is used.

When the uplink data is retransmitted along with the CQI/PMI and thesubframe set used for the initial transmission of the uplink data isdifferent from the subframe set used for the current retransmission ofthe uplink data, the number Q′ of modulation symbols is calculated usingExpression 2 of the following expression.

                                       [Math.  2]$Q^{\prime} = {\min\begin{pmatrix}{\left\lceil \frac{\left( {O + L} \right) \cdot M_{sc}^{{PUSCH} - {{initial}{(x)}}} \cdot N_{symb}^{{PUSCH} - {{initial}{(x)}}} \cdot \beta_{offset}^{PUSCH} \cdot \gamma_{offset}}{\sum\limits_{r = 0}^{C^{(x)} - 1}\; K_{r}^{(x)}} \right\rceil,} \\{{M_{sc}^{PUSCH} \cdot N_{symb}^{PUSCH}} - \frac{Q_{RI}^{(x)}}{Q_{m}^{(x)}}}\end{pmatrix}}$

Here, γ_(offset) is a second offset value of which the base stationapparatus 3 notifies the terminal apparatus 1 using a radio resourcecontrol signal (RRC) or the like. The terminal apparatus 1 calculates Q′by applying β^(PUSCH) _(offset) and γ_(offset) configured by the basestation apparatus 3 to Expression 2.

When the value of γ_(offset) is 1 from a relation between Expressions 1and 2, Expressions 1 and 2 become the same expression. Q′ is determinedwithout dependence on the subframe set used for the transmission of theCQI/PMI. The value of Q′ is calculated as different values between acase in which the uplink data is retransmitted and the subframe set usedfor the initial transmission of the uplink data is different from thesubframe set used for the current retransmission of the uplink data andthe other cases when the value of γ_(offset) is a value other than 1.

Here, γ_(offset) is offset to configure a coding rate appropriate forensuring reception quality of the CQI/PMI in the base station apparatus3 when the subframe set used for the initial transmission of the uplinkdata transmitted together at the time of the transmission of the CQI/PMIin the PUSCH is different from the subframe set used for the currentuplink data.

Here, γ_(offset) is configured to be a different value according to thesubframe set used for the initial transmission of the uplink datatogether transmitted on the PUSCH at the time of the transmission of theCQI/PMI. A case in which two kinds of first and second subframe sets areconfigured will be exemplified. When the subframe set used for theinitial transmission of the uplink data is the first subframe set andthe retransmission of the uplink data and the transmission of theCQI/PMI are simultaneously performed with the PUSCH in the secondsubframe set, “γ_(offset)=γ_(1,2)” is configured. When the subframe setused for the initial transmission of the uplink data is the secondsubframe set and the retransmission of the uplink data and thetransmission of the CQI/PMI are simultaneously performed with the PUSCHin the first subframe set, “γ_(offset)=γ_(2,1)” is configured. The basestation apparatus 3 may notify the terminal apparatus 1 of such γ_(1,2)and γ_(2,1) with the RRC signals.

Here, only γ_(1,2) may be notified of and a form of “γ_(2,1)=1/γ_(1,2)”may be set. That is, γ_(2,1) may be a reciprocal of γ_(1,2).

Alternatively, when the uplink data is retransmitted along with theCQI/PMI and the subframe set used for the initial transmission of theuplink data is different from the subframe set used for the currentretransmission of the uplink data, the number Q′ of modulation symbolsis calculated using Expressions 3 and 4 of the following expressionsrather than the foregoing Expression 2.

                                       [Math.  3]$Q^{\prime} = {\min\begin{pmatrix}{\left\lceil \frac{\left( {O + L} \right) \cdot M_{sc}^{{PUSCH} - {{initial}{(x)}}} \cdot N_{symb}^{{PUSCH} - {{initial}{(x)}}} \cdot \beta_{{offset},2}^{PUSCH}}{\sum\limits_{r = 0}^{C^{(x)} - 1}\; K_{r}^{(x)}} \right\rceil,} \\{{M_{sc}^{PUSCH} \cdot N_{symb}^{PUSCH}} - \frac{Q_{RI}^{(x)}}{Q_{m}^{(x)}}}\end{pmatrix}}$                                       [Math.  4]$Q^{\prime} = {\min\begin{pmatrix}{\left\lceil \frac{\left( {O + L} \right) \cdot M_{sc}^{{PUSCH} - {{initial}{(x)}}} \cdot N_{symb}^{{PUSCH} - {{initial}{(x)}}} \cdot \beta_{{offset},3}^{PUSCH}}{\sum\limits_{r = 0}^{C^{(x)} - 1}\; K_{r}^{(x)}} \right\rceil,} \\{{M_{sc}^{PUSCH} \cdot N_{symb}^{PUSCH}} - \frac{Q_{RI}^{(x)}}{Q_{m}^{(x)}}}\end{pmatrix}}$

When the subframe set used for the initial transmission of the uplinkdata is the first subframe set and the retransmission of the uplink dataand the transmission of the CQI/PMI are simultaneously performed withthe PUSCH in the second subframe set, Q′ is calculated using Expression3. When the subframe set used for the initial transmission of the uplinkdata is the second subframe set and the retransmission of the uplinkdata and the transmission of the CQI/PMI are simultaneously performedwith the PUSCH in the first subframe set, Q′ is calculated usingExpression 4.

Accordingly, when Q′ is calculated using Expression 1, 3, and 4, thebase station apparatus 3 notifies the terminal apparatus 1 of threevalues, β^(PUSCH) _(offset), β^(PUSCH) _(offset,2), and β^(PUSCH)_(offset,3), as offsets with the RRC signals. When the uplink data isinitially transmitted along with the CQI/PMI or when the uplink data isretransmitted along with the CQI/PMI and the subframe set used for theinitial transmission of the uplink data is the same as the subframe setused for the current retransmission of the uplink data, β^(PUSCH)_(offset) is configured in the offset (Q′ is calculated using Expression1). When the subframe set used for the initial transmission of theuplink data is the first subframe set and the retransmission of theuplink data and the transmission of the CQI/PMI are simultaneouslyperformed with the PUSCH in the second subframe set, βPUSCH_(offset,2)is configured in the offset (Q′ is calculated using Expression 3). Whenthe subframe set used for the initial transmission of the uplink data isthe second subframe set and the retransmission of the uplink data andthe transmission of the CQI/PMI are simultaneously performed with thePUSCH in the first subframe, β^(PUSCH) _(offset,3) is configured in theoffset (Q′ is calculated using Expression 4).

Here, in the foregoing examples, the plurality of expressions,Expressions 1, 3, and 4 have been described. However, these expressionsmay be unified to be expressed as Expression 5.

                                       [Math. 5]$Q^{\prime} = {\min\begin{pmatrix}{\left\lceil \frac{\left( {O + L} \right) \cdot M_{sc}^{{PUSCH} - {{initial}{(x)}}} \cdot N_{symb}^{{PUSCH} - {{initial}{(x)}}} \cdot \beta_{offset}}{\sum\limits_{r = 0}^{C^{(x)} - 1}\; K_{r}^{(x)}} \right\rceil,} \\{{M_{sc}^{PUSCH} \cdot N_{symb}^{PUSCH}} - \frac{Q_{RI}^{(x)}}{Q_{m}^{(x)}}}\end{pmatrix}}$

For B_(offset), “B_(offset)=β^(PUSCH) _(offset)” is configured when theuplink data is initially transmitted along with the CQI/PMI or when theuplink data is retransmitted along with the CQI/PMI and the subframe setused for the initial transmission of the uplink data is the same as thesubframe set used for the current retransmission of the uplink data.“B_(offset)=β^(PUSCH) _(offset,2)” is configured when the subframe setused for the initial transmission of the uplink data is the firstsubframe set and the retransmission of the uplink data and thetransmission of the CQI/PMI are simultaneously performed with the PUSCHin the second subframe set. “B_(offset)=β^(PUSCH) _(offset,3)” isconfigured when the subframe set used for the initial transmission ofthe uplink data is the second subframe set and the retransmission of theuplink data and the transmission of the CQI/PMI are simultaneouslyperformed with the PUSCH in the first subframe set.

Here, in the foregoing example, the case in which the subframe sets aretwo kinds of subframe sets has been described. However, even when thesubframe sets are three or more kinds of subframe sets, the same can berealized by increasing the number of offsets which are notified of withthe RRC signal.

Here, when the value of the offset used to calculate the number ofmodulation symbols for the CQI/PMI is configured, as described above,the terminal apparatus 1 necessarily stores the subframe set used forthe initial transmission of the uplink data and necessarily specifiesthe value of the offset according to the subframe set used for theretransmission of the uplink data along with the stored subframe set andthe CQI/PMI. On the other hand, the terminal apparatus 1 may specify(configure) the value of the offset based on the subframe set for thetransmission of the CQI/PMI without dependence on the subframe set forthe initial transmission of the uplink data. In this case, the terminalapparatus 1 can calculate the number of modulation symbols of theCQI/PMI using, for example, Expression 6.

                                       [Math. 6]$Q^{\prime} = {\min\begin{pmatrix}{\left\lceil \frac{\left( {O + L} \right) \cdot M_{sc}^{{PUSCH} - {{initial}{(x)}}} \cdot N_{symb}^{{PUSCH} - {{initial}{(x)}}} \cdot \beta_{offset}^{\prime}}{\sum\limits_{r = 0}^{C^{(x)} - 1}\; K_{r}^{(x)}} \right\rceil,} \\{{M_{sc}^{PUSCH} \cdot N_{symb}^{PUSCH}} - \frac{Q_{RI}^{(x)}}{Q_{m}^{(x)}}}\end{pmatrix}}$

Here, as B′_(offset), “B′_(offset)=β^(PUSCH) _(offset,1)” is set whenthe CQI/PMI is transmitted on the PUSCH in the first subframe set, and“B′_(offset)=β^(PUSCH) _(offset,2)” is configured when the CQI/PMI istransmitted on the PUSCH in the second subframe set. Here, β^(PUSCH)_(offset,1) and β^(PUSCH) _(offset,2) are the values of the offsetsconfigured by the RRC signal from the base station apparatus 3. Thus, byallowing the values of the offsets configured based on the subframe setsfor the transmission of the CQI/PMI to be different values, it ispossible to configure the appropriate number of modulation symbols forthe CQI/PMI according to channel characteristics different for eachsubframe set.

Here, for B′_(offset) in Expression 6, the independent values have beenconfigured according to the two kinds of first and second subframe sets.However, when three or more kinds of subframe sets are configured, avalue may be configured for each subframe set.

On the other hand, the base station apparatus 3 can determine thesubframe set in which the uplink data is initially transmitted based onthe timing at which the uplink data is received from the terminalapparatus 1. Further, the base station apparatus 3 can specify thesubframe set of the subframes in which the CSI/PMI is received based onthe transmission timing of the uplink grant making the CSI request tothe terminal apparatus 1. That is, when the base station apparatus 3transmits the CSI request, the base station apparatus 3 can specify theinitial transmission or the retransmission of the uplink data along withthe CQI/PMI on the PUSCH, and specify the appropriate value of theoffset which is used for the terminal apparatus 1 to calculate thenumber of modulation symbols for the CQI/PMI according to thecombination of the subframe set used for the initial transmission of theuplink data and the subframe set used for the current retransmission ofthe uplink data at the time of the retransmission of the uplink data.Accordingly, when the base station apparatus 3 transmits the CSI requestusing a plurality of bits and designates the value of the offsetaccording to the combination of the plurality of bits, the terminalapparatus 1 can configure the value of the offset without dependence onthe kinds of subframe sets at the time of the initial transmission andthe retransmission of the uplink data.

FIG. 17 illustrates examples of the values of the offsets β^(PUSCH)_(offset) when a 3-bit CSI request field is used. Here, the terminalapparatus 1 is assumed to derive the number Q′ of modulation symbols(modulation coded symbols) used to transmit the CQI/PMI usingExpression 1. The value “000” of the CSI field is used when the basestation apparatus 3 does not request the terminal apparatus 1 totransmit the CSI and it is not necessary to configure β^(PUSCH)_(offset). When the value of the CSI field is “001,” the terminalapparatus 1 configures a first value configured by the higher layer inβ^(PUSCH) _(offset). Likewise, when the value of the CSI field is “010,”“011,” “100,” “101,” “110,” and “111,” the terminal apparatus 1configures a second value, a third value, a fourth value, a fifth value,a sixth value, and a seventh value configured by the higher layer inβ^(PUSCH) _(offset,) respectively. Here, the first value to the seventhvalue may not necessarily be different values and some of the values maybe the same.

Here, when the CSI field with a plurality of bits is used, the values ofthe offsets and other pieces of information may be combined andconfigured. For example, when a plurality of serving cells are used inthe downlink and the CSI is derived by selection from the plurality ofserving cells, and/or when there are a plurality of processestransmitting the CSI, and/or when there are a plurality of subframe setsused in the downlink, the downlink serving cells deriving the CSI, theCSI processes, and triggers of the subframe sets may correspond to theCSI request field with the plurality of bits. FIG. 18 illustratescombinations of the serving cells in which an aperiodic CSI istriggered, the CSI processes, and the subframe sets and examples of thevalues of the offsets used for the calculation of the number ofmodulation symbols of the CQI/PMI according to the values of the 3-bitCSI fields. When the value of the CSI field is “000,” the base stationapparatus 3 does not request the terminal apparatus 1 to report the CSIand β^(PUSCH) _(offset) is not configured. When the value of the CSIfield is “001,” the base station apparatus 3 requests the terminalapparatus 1 to report a periodic CSI of a serving cell c used totransmit the aperiodic CSI and configures β^(PUSCH) _(offset) to be usedfor the calculation of the number of modulation symbols of the CQI/PMIin this case as a first value configured by a higher layer. Here, theCSI process and/or the subframe set which are reported are configured bythe higher layer. When the values of the CSI field are “010” to “111,”the base station apparatus 3 requests the terminal apparatus 1 to reportthe aperiodic CSI and configures β^(PUSCH) _(offset) to be used for thecalculation of the number of modulation symbols of the CQI/PMI in thiscase as second to seventh values configured by the higher layers,respectively. Here, the serving cells, and/or the CSI processes, and/orthe subframe sets to be reported when the CSI field is “010” to “111”are first to sixth sets configured by the higher layers.

Here, in FIG. 18, the serving cell to be reported when the value of theCSI field is “001” has been the serving cell c used to transmit theaperiodic CSI. However, the higher layer may be configured as in thecases of “010” to “111.”

Here, in FIG. 18, when the values of the CSI field is “010” to “111,”the combinations of the serving cells in which the aperiodic CSI istriggered, the CSI processes, and the subframe sets have been describedas the first to sixth sets, but some of the sets may be defined to bethe same set. For example, when the value of the CSI field is “011,” thereport of the aperiodic CSI in regard to the first set may be defined tobe triggered.

Here, in FIG. 18, β^(PUSCH) _(offset) used for the calculation of thenumber of modulation symbols of the CQI/PMI when the values of the CSIfield is “001” to “111” has been the first to seventh values configuredby the higher layers, but some of the values may be defined to bedesignated as the same value. For example, β^(PUSCH) _(offset) used whenthe value of the CSI field is “111” may be defined to be the same as thefirst value configured by the higher layer. In this case, it is notnecessary to configure the seventh value by the higher layer.

Here, in FIG. 18, β^(PUSCH) _(offset) used for the calculation of thenumber of modulation symbols of the CQI/PMI when the values of the CSIfield are “001” to “111” has been the first to seventh values configuredby the higher layers, but some of the values may be defined to bedesignated as reciprocals thereof. For example, β^(PUSCH) _(offset) usedwhen the value of the CSI field is “110” may be defined to be thereciprocal of the first value configured by the higher layer. In thiscase, it is not necessary to configure the sixth value by the higherlayer.

FIG. 19 is a schematic block diagram illustrating the structure of theterminal apparatus 1 according to the embodiment. As illustrated, theterminal apparatus 1 includes a higher layer processing unit 101, acontrol unit 103, a reception unit 105, a transmission unit 107, and atransmission/reception antenna 109. The higher layer processing unit 101includes a radio resource control unit 1011, a subframe configurationunit 1013, a scheduling information interpretation unit 1015, and achannel state information (CSI) report control unit 1017. The receptionunit 105 includes a decoding unit 1051, a demodulation unit 1053, amultiplex separation unit 1055, a radio reception unit 1057, and achannel measurement unit 1059. The transmission unit 107 includes acoding unit 1071, a modulation unit 1073, a multiplexing unit 1075, aradio transmission unit 1077, and an uplink reference signal generationunit 1079.

The higher layer processing unit 101 outputs the uplink data (transportblock) generated through a user's operation or the like to thetransmission unit 107. The higher layer processing unit 101 performsprocesses for a medium access control (MAC) layer, a packet dataconvergence protocol (PDCP) layer, a radio link control (RLC) layer, anda radio resource control (RRC) layer.

The radio resource control unit 1011 included in the higher layerprocessing unit 101 manages various kinds of configuration informationof the terminal apparatus. The radio resource control unit 1011generates information arranged in each uplink channel and outputs theinformation to the transmission unit 107.

The subframe configuration unit 1013 included in the higher layerprocessing unit 101 manages the uplink reference UL-DL configuration,the downlink reference UL-DL configuration, and the transmissiondirection UL-DL configuration. The subframe configuration unit 1013 setsthe uplink reference UL-DL configuration, the downlink reference UL-DLconfiguration, and the transmission direction UL-DL configuration. Thesubframe configuration unit 1013 sets at least two subframe sets.

The scheduling information interpretation unit 1015 included in thehigher layer processing unit 101 analyzes the DCI format (schedulinginformation) received via the reception unit 105, generates controlinformation to control the reception unit 105 and the transmission unit107 based on the analysis result of the DCI format, and outputs thecontrol information to the control unit 103.

The scheduling information interpretation unit 1015 determines timingsat which a transmission process and a reception process are performedbased on the uplink reference UL-DL configuration, the downlinkreference UL-DL configuration, and/or the transmission direction UL-DLconfiguration.

The channel state information report control unit 1017 specifies the CSIreference resource. The Channel state information report control unit1017 instructs the channel measurement unit 1059 to derive the CQIassociated with the CSI reference resource. The Channel stateinformation report control unit 1017 instructs the transmission unit 107to transmit the CQI. The Channel state information report control unit1017 sets the configuration used when the channel measurement unit 1059calculates the CQI.

The control unit 103 generates control signals used to control thetransmission unit 105 and the transmission unit 107 based on the controlinformation from the higher layer processing unit 101. The control unit103 outputs the generated control signals to the reception unit 105 andthe transmission unit 107 to control the reception unit 105 and thetransmission unit 107.

The reception unit 105 separates, demodulates, and decodes a receivedsignal received from the base station apparatus 3 via thetransmission/reception antenna 109 according to the control signal inputfrom the control unit 103 and outputs decoded information to the higherlayer processing unit 101.

The radio reception unit 1057 converts (downconverts) a downlink signalreceived via the transmission/reception antenna 109 into a basebandsignal through quadrature demodulation, removes an unnecessary frequencycomponent, controls an amplification level so that the signal level isappropriately maintained, performs the quadrature demodulation based onan in-phase component and a quadrature component of the received signal,and converts the analog signal subjected to the quadrature demodulationinto a digital signal. The radio reception unit 1057 removes a portioncorresponding to the cyclic prefix (CP) from the converted digitalsignal and performs fast Fourier transform (FFT) on the signal fromwhich the CP is removed to extract a signal of the frequency domain.

The multiplex separation unit 1055 separates the extracted signal intothe PHICH, the PDCCH, the EPDCCH, the PDSCH, and the downlink referencesignal. The multiplex separation unit 1055 compensates for channels ofthe PHICH, the PDCCH, the EPDCCH, and the PDSCH from estimated values ofthe channels input from the channel measurement unit 1059. The multiplexseparation unit 1055 outputs the separated downlink reference signal tothe channel measurement unit 1059.

The demodulation unit 1053 multiplies a corresponding code to the PHICHto combine the code, demodulates the combined signal according to thebinary phase shift keying (BPSK) modulation scheme, and outputs thedemodulated signal to the decoding unit 1051. The decoding unit 1051decodes the PHICH for the terminal apparatus and outputs the decodedHARQ indicator to the higher layer processing unit 101. The demodulationunit 1053 demodulates the PDCCH and/or the EPDCCH according to the QPSKdemodulation scheme and outputs the demodulated signal to the decodingunit 1051. The decoding unit 1051 attempts to decode the PDCCH and/orthe EPDCCH. When the decoding unit 1051 succeeds in the decoding, thedecoding unit 1051 outputs decoded downlink control information and theRNTI corresponding to the downlink control information to the higherlayer processing unit 101.

The demodulation unit 1053 performs demodulation on the PDSCH accordingto a demodulation scheme notified of with the downlink grant, such asthe quadrature phase shift keying (QPSK), 16 quadrature amplitudemodulation (QAM), or 64 QAM and outputs the demodulated result to thedecoding unit 1051. The decoding unit 1051 performs decoding based oninformation regarding the encoding rate notified of with the downlinkcontrol information and outputs the decoded downlink data (transportblock) to the higher layer processing unit 101.

The channel measurement unit 1059 measures a path loss or a channelstate of the downlink from the downlink reference signal input from themultiplex separation unit 1055 and outputs the measured path loss orchannel state to the higher layer processing unit 101. The channelmeasurement unit 1059 calculates an estimated value of the downlinkchannel from the downlink reference signal and outputs the estimatedvalue to the multiplex separation unit 1055. The channel measurementunit 1059 performs channel measurement and/or interference measurementto calculate the CQI.

The transmission unit 107 generates an uplink reference signal accordingto the control signal input from the control unit 103, codes andmodulates the uplink data (transport block) input from the higher layerprocessing unit 101, multiplexes the PUCCH, the PUSCH, and the generateduplink reference signal, and transmits the multiplexed PUCCH, PUSCH, anduplink reference signal to the base station apparatus 3 via thetransmission/reception antenna 109.

The coding unit 1071 codes the uplink control information and the uplinkdata input from the higher layer processing unit 101 and outputs theuplink control information and the uplink data to the modulation unit1073. FIG. 20 is a schematic block diagram illustrating the structure ofthe coding unit 1071 according to the present invention. The coding unit1071 includes a data coding unit 1071 a, a number-of-modulation-symbolsdetermination unit 1071 b, a CQI coding unit 1071 c, a data controlinformation multiplexing unit 1071 d, and an interleaving unit 1071 e.

The data coding unit 1071 a adds the cyclic redundancy check code toA-bit uplink data of a_(i) uplink (0≤i≤A−1) input from the higher layer101 based on the uplink grant received from the base station apparatus3, perform error correction coding, and outputs coded bits f_(j)(0≤j≤G−1) of G-bit uplink data generated through rate matching to thedata control information multiplexing unit 1071 d.

The number-of-modulation-symbols determination unit 1071 b determinesthe number Q′ of modulation symbols used for the transmission of theCQI/PMI coded in the CQI coding unit 1071 c. Here, the Q′ calculationmethod has been described above. The number-of-modulation-symbolsdetermination unit 1071 b outputs the calculated Q′ to the CQI codingunit 1071 c.

The CQI coding unit 1071 c codes CQI bits o_(k) (0≤k≤O−1) of O bitsinput from the higher layer processing unit 101 and outputs coded CQIbits q₁ (0≤1≤N_(L)·Q_(CQI)-1) to the data control informationmultiplexing unit 1071 d. Here, the number N_(L)·Q_(CQI) of bits afterthe coding is calculated using Q′ input from thenumber-of-modulation-symbols determination unit 1071 b,Q_(CQI)=Q(x)_(m)×Q′, and N_(L) is the number of layers used for thetransmission.

The coded bit f_(j) of the uplink data and the coded bit q₁ of the CQIare input to the data control information multiplexing unit 1071 d.Then, the data control information multiplexing unit 1071 d multiplexesthese bits and outputs H-bit coded bits g_(n) (0≤n≤H−1) to theinterleaving unit 1071 e. Here, H=G+Q_(CQI).

The interleaving unit 1071 e interleaves the coded bits g_(n) input fromthe data control information multiplexing unit 1071 d and outputs theinterleaved bits to the modulation unit 1073. Here, in FIG. 20, theexample in which the interleaving is performed on only the multiplexeduplink data and the coded bits of the CQI/PMI has been described.However, the interleaving may be performed after the coded bits of theHARQ-ACK, the RI included in the CSI, or the like are connected. Adifferent calculation method can also be applied for each subframe setto the number of modulation symbols used in the coded bits of theconnected RI or HARQ-ACK, as in the case of the CQI/PMI indicated in thepresent invention.

The modulation unit 1073 modulates the coded bits input from the codingunit 1071 according to a modulation scheme notified of with the downlinkcontrol information, such as the BPSK, the QPSK, the 16 QAM, or the 64QAM or a modulation scheme determined in advance for each channel. Themodulation unit 1073 determines the number of serieses of spatiallymultiplexed data based on the information used for the scheduling of thePUSCH, maps the plurality of pieces of uplink data transmitted with thesame PUSCH to the plurality of serieses by using multiple input multipleoutput (MIMO) Spatial Multiplexing (SM), and performs precoding on theseries.

The uplink reference signal generation unit 1079 generates a seriesobtained by a rule (expression) determined in advance based on aphysical cell identity (PCI: referred to as a Cell ID or the like) foridentifying the base station apparatus 3, a bandwidth in which theuplink reference signal is arranged, a cyclic shift notified of with theuplink grant, the values of parameters for generation of a DMRSsequence, and the like. The multiplexing unit 1075 sorts the modulationsymbols of the PUSCH in parallel according to the control signal inputfrom the control unit 103, and then performs discrete Fourier transform(DFT). The multiplexing unit 1075 multiplexes the signals of the PUSCHand the PUSCH and the generated uplink reference signal for eachtransmission antenna port. That is, the multiplexing unit 1075 arrangesthe signals of the PUCCH and the PUSCH and the generated uplinkreference signal in the resource element for each transmission antennaport.

The radio transmission unit 1077 performs inverse fast Fourier transform(IFFT) on the multiplexed signals, generates the SC-FDMA symbols, addsthe CP to the generated SC-FDMA symbols, generates a baseband digitalsignal, converts the baseband digital signal into an analog signal,removes an excessive frequency component using a lowpass filter,performs upconverting on a carrier frequency, performs poweramplification, and outputs the signal to the transmission/receptionantenna 109 to transmit the signal.

FIG. 21 is a schematic block diagram illustrating the structure of thebase station apparatus 3 according to the embodiment. As illustrated,the base station apparatus 3 includes a higher layer processing unit301, a control unit 303, a reception unit 305, a transmission unit 307,and a transmission/reception antenna 309. The higher layer processingunit 301 includes a radio resource control unit 3011, a subframeconfiguration unit 3013, a scheduling unit 3015, and a channel stateinformation (CSI) report control unit 3017. The reception unit 305includes a decoding unit 3051, a demodulation unit 3053, a multiplexseparation unit 3055, a radio reception unit 3057, and a channelmeasurement unit 3059. The transmission unit 307 includes a coding unit3071, a modulation unit 3073, a multiplexing unit 3075, a radiotransmission unit 3077, and a downlink reference signal generation unit3079.

The higher layer processing unit 301 performs processes for a mediumaccess control (MAC) layer, a packet data convergence protocol (PDCP)layer, a radio link control (RLC) layer, and a radio resource control(RRC) layer. The higher layer processing unit 301 generates controlinformation to control the reception unit 305 and the transmission unit307 and outputs the control information to the control unit 303.

The radio resource control unit 3011 included in the higher layerprocessing unit 301 generates the downlink data (transport block)arranged in the downlink PDSCH, the system information, the RRC message,the MAC CE (Control Element), and the like or acquires the downlinkdata, the system information, the RRC message, the MAC CE, and the likefrom an upper node, and then outputs the downlink data, the systeminformation, the RRC message, the MAC CE, and the like to thetransmission unit 307. The radio resource control unit 3011 managesvarious kinds of configuration information of each terminal apparatus 1.

The subframe configuration unit 3013 included in the higher layerprocessing unit 301 performs management of the uplink reference UL-DLconfiguration, the downlink reference UL-DL configuration, and thetransmission direction UL-DL configuration on each terminal apparatus 1.The subframe configuration unit 3013 sets the uplink reference UL-DLconfiguration, the downlink reference UL-DL configuration, and thetransmission direction UL-DL configuration in each terminal apparatus 1.

The subframe configuration unit 3013 generates first informationindicating the uplink reference UL-DL configuration, second informationindicating the downlink reference UL-DL configuration, and thirdinformation indicating the transmission direction UL-DL configuration.The subframe configuration unit 3013 transmits the first information,the second information, and the third information to the terminalapparatus 1 via the transmission unit 307.

The base station apparatus 3 may determine the uplink reference UL-DLconfiguration, the downlink reference UL-DL configuration, and/or thetransmission direction UL-DL configuration for the terminal apparatus 1.The base station apparatus 3 may be instructed from an upper node toperform the uplink reference UL-DL configuration, the downlink referenceUL-DL configuration, and/or the transmission direction UL-DLconfiguration for the terminal apparatus 1.

For example, the subframe configuration unit 3013 may determine theuplink reference UL-DL configuration, the downlink reference UL-DLconfiguration, and/or the transmission direction UL-DL configurationbased on an uplink traffic amount and a downlink traffic amount.

The subframe configuration unit 3013 manages at least two subframe sets.The subframe configuration unit 3013 may also set at least two subframesets for each terminal apparatus 1. The subframe configuration unit 3013may also set at least two subframe sets for each serving cell. Thesubframe configuration unit 3013 may also set at least two subframe setsfor each CSI process.

The subframe configuration unit 3013 transmits information indicating atleast the two subframes sets to the terminal apparatus 1 via thetransmission unit 307.

The scheduling unit 3015 included in the higher layer processing unit301 determines the frequencies and the subframes for allocating thephysical channels (the PDSCH and the PUSCH) and the coding rate,modulation scheme, transmission power, and the like of the physicalchannels (the PDSCH and the PUSCH) for allocating the physical channels(the PDSCH and the PUSCH) from the received channel state information,the estimated value of the channel or the channel quality input from thechannel measurement unit 3059, and the like. The scheduling unit 3015determines whether to schedule the downlink physical channels and/or thedownlink physical signals in the flexible subframes or to schedule theuplink physical channels and/or the uplink physical signals. Thescheduling unit 3015 generates control information (for example, the DCIformat) to control the reception unit 305 and the transmission unit 307based on the scheduling result and outputs the control information tothe control unit 303.

Based on the scheduling result, the scheduling unit 3015 generatesinformation used for the scheduling of the physical channels (the PDSCHand the PUSCH). The scheduling unit 3015 also determines timings atwhich the transmission process and the reception process are performedbased on the uplink reference UL-DL configuration, the downlinkreference UL-DL configuration, and/or the transmission direction UL-DLconfiguration.

The CSI report control unit 3017 included in the higher layer processingunit 301 controls the CSI report of the terminal apparatus 1. The CSIreport control unit 3017 transmits information indicating various kindsof settings and assumed for the terminal apparatus 1 to derive the CQIin the CSI reference resource to the terminal apparatus 1 via thetransmission unit 307.

Based on the control information from the higher layer processing unit301, the control unit 303 generates the control signal to control thereception unit 305 and the transmission unit 307. The control unit 303outputs the generated control signal to the reception unit 305 and thetransmission unit 307 to control the reception unit 305 and thetransmission unit 307.

The reception unit 305 separates, demodulates, and decodes the receivedsignal received from the terminal apparatus 1 via thetransmission/reception antenna 309 according to the control signal inputfrom the control unit 303 and outputs the decoded information to thehigher layer processing unit 301. The radio reception unit 3057 converts(downconverts) the uplink signal received via the transmission/receptionantenna 309 into a baseband signal through quadrature demodulation,removes an unnecessary frequency component, controls an amplificationlevel so the signal level is appropriately maintained, performs thequadrature demodulation based on an in-phase component and a quadraturecomponent of the received signal, and converts the analog signalsubjected to the quadrature demodulation into a digital signal.

The radio reception unit 3057 removes a portion corresponding to thecyclic prefix (CP) from the converted digital signal. The radioreception unit 3057 performs fast Fourier transform (FFT) on the signalfrom which the CP is removed to extract a signal of the frequency domainand outputs the extracted signal to the multiplex separation unit 3055.

The multiplex separation unit 1055 separates the signal input from theradio reception unit 3057 into signals such as the PUCCH, the PUSCH, andthe uplink reference signal. This separation is determined by the radioresource control unit 3011 of the base station apparatus 3 in advanceand is performed based on allocation information of the radio resourceincluded in the uplink grant of which each terminal apparatus 1 isnotified. The multiplex separation unit 3055 compensates for the channelof the PUCCH and the PUSCH from the estimated value of the channel inputfrom the channel measurement unit 3059. The multiplex separation unit3055 outputs the separated uplink reference signals to the channelmeasurement unit 3059.

The demodulation unit 3053 performs inverse discrete Fourier transform(IDFT) on the PUSCH, acquires the modulation symbols, and demodulatesthe received signal on each of the modulation symbols of the PUCCH andthe PUSCH using a modulation scheme determined in advance, such asbinary phase shift keying (BPSK), QPSK, 16 QAM, or 64 QAM, or amodulation scheme of which the base station apparatus notifies eachterminal apparatus 1 in advance with the uplink grant. The demodulationunit 3053 separates the modulation symbols of the plurality of pieces ofuplink data transmitted with the same PUSCH by using the MIMO SM, basedon the number of spatially multiplexed serieses of which each terminalapparatus 1 is notified in advance with the uplink grant and informationindicating the precoding performed on the series.

The decoding unit 3051 decodes the demodulated coded bits of the PUCCHand the PUSCH at the coding rate which is the coding rate of the codingscheme determined in advance and which is determined in advance or ofwhich the base station apparatus notifies the terminal apparatus 1 inadvance with the uplink grant, and then outputs the decoded uplink dataand the uplink control information to the higher layer processing unit301. When the PUSCH is retransmitted, the decoding unit 3051 performsthe decoding using the coded bits input from the higher layer processingunit 301 and retained in an HARQ buffer and the demodulated coded bits.FIG. 22 is a schematic block diagram illustrating the structure in whicha PUSCH decoding process is performed in the decoding unit 3051according to the present invention. The decoding unit 3051 includes ade-interleaving unit 3051 a, a number-of-modulation-symbols specifyingunit 3051 b, a data control information separation unit 3051 c, a datadecoding unit 3051 d, and a CQI decoding unit 3051 e.

The de-interleaving unit 3051 a de-interleaves coded bits h′_(n)(0≤n≤H−1) of the H-bit PUSCH input from the demodulation unit 3053 andoutputs the coded bits g′_(n) after the de-interleaving to the datacontrol information separation unit 3051 c. Here, in FIG. 22, all of thecoded bits are structured to be output to the data control informationseparation unit 3051 c. However, when the coded bits of the HARQ-ACK,the RI included in the CSI, or the like are included, the coded bits maybe separated to be separately subjected to a decoding process. When thenumber of coded bits of the separated RI or HARQ-ACK is calculated, adifferent calculation method can be applied for each subframe set as inthe case of the CQI/PMI according to the present invention.

In order to extract the bits corresponding to the CQI/PMI among thecoded bits output from the de-interleaving unit 3051 a, thenumber-of-modulation-symbols specifying unit 3051 b specifies the numberQ′ of modulation symbols corresponding to the bits and outputs thenumber Q′ of modulation symbols to the data control informationseparation unit 3051 c. Here, as a method of calculating Q′, the samemethod as the method of the number-of-modulation-symbols determinationunit 1071 b of the terminal apparatus 1 is used and parameters necessaryfor the calculation are acquired from the higher layer processing unit301.

The data control information separation unit 3051 c extracts coded bitsf′_(j) (0≤j≤G−1) of the G bits corresponding to the uplink data andcoded bits q′₁ (0≤1≤N_(L)·Q_(CQI)−1) of N_(L)·Q_(CQI) of bitscorresponding to the CQI/PMI from the coded bits g′_(n) output from thede-interleaving unit 3051 a, outputs f′_(j) to the data decoding unit3051 d, and outputs q′₁ to the CQI decoding unit 3051 e. Here, thenumber N_(L)·Q_(CQI) of bits after the coding is calculated using Q′input from the number-of-modulation-symbols specifying unit 3051 b,Q_(CQI)=Q(x)_(m)×Q′, and N_(L) is the number of layers used for thetransmission.

The data decoding unit 3051 d performs a decoding process on the uplinkdata based on the uplink grant transmitted to the terminal apparatus 1.The data decoding unit 3051 d decodes A-bit uplink data a′_(i) (0≤i≤A−1)from the coded bits f input from the data control information separationunit 3051 c and outputs the decoded data to the higher layer processingunit 301.

The CQI decoding unit 3051 e decodes 0-bit CQI bits o_(k) (0≤k≤O−1) fromthe coded bits q′₁ input from the data control information separationunit 3051 c and outputs the decoded bits to the higher layer processingunit 301.

The channel measurement unit 3059 measures an estimated value of thechannel, the channel quality, and the like from the uplink referencesignal input from the multiplex separation unit 3055 and outputs theestimated value, the channel quality, and the like to the multiplexseparation unit 3055 and the higher layer processing unit 301.

The transmission unit 307 generates the downlink reference signalaccording to the control signal input from the control unit 303, codesand modulates the HARQ indicator, the downlink control information, andthe downlink data input from the higher layer processing unit 301,multiplexes the PHICH, the PDCCH, the EPDCCH, the PDSCH, and thedownlink reference signal, and transmits the multiplexed signals to theterminal apparatus 1 via the transmission/reception antenna 309.

The coding unit 3071 codes the HARQ indicator, the downlink controlinformation, and the downlink data input from the higher layerprocessing unit 301 using a coding scheme determined in advance, such asblock coding, convolution coding, or turbo coding or codes the HARQindicator, the downlink control information, and the downlink data usingthe coding scheme determined by the radio resource control unit 3011.The modulation unit 3073 modulates the coded bits input from the codingunit 3071 according to the modulation scheme determined in advance, suchas the BPSK, the QPSK, the 16 QAM, or the 64 QAM, or the modulationscheme determined by the radio resource control unit 3011.

The downlink reference signal generation unit 3079 generates the serieswhich is obtained according to a rule determined in advance based on thephysical cell identifier (PCI) or the like for identifying the basestation apparatus 3 and is known by the terminal apparatus 1, as thedownlink reference signal. The multiplexing unit 3075 multiplexes themodulated modulation symbol of each channel and the generated downlinkreference signal. That is, the multiplexing unit 3075 arranges themodulated modulation symbol of each channel and the generated downlinkreference signal in the resource element.

The radio transmission unit 3077 performs inverse fast Fourier transform(IFFT) on the multiplexed modulation symbols, generates the OFDMsymbols, adds the CP to the generated OFDM symbols, generates a basebanddigital signal, converts the baseband digital signal into an analogsignal, removes an excessive frequency component using a lowpass filter,performs upconverting on a carrier frequency, performs poweramplification, and outputs the signal to the transmission/receptionantenna 309 to transmit the signal.

From the above, the terminal apparatus 1 according to the presentinvention may have the following characteristics.

(1) The terminal apparatus 1 according to the embodiment is the terminalapparatus 1 which communicates with the base station apparatus 3 andincludes the number-of-modulation-symbols determination unit 1071 b thatdetermines the number of modulation symbols for the channel stateinformation transmitted on the physical uplink shared channel based onthe value of an offset; and the transmission unit 107 that transmits thechannel state information to the base station apparatus 3 on thephysical uplink shared channel. When two subframe sets are configured byhigher layers, the value of the offset is determined depending on thesubframe set to which subframes for transmission on the physical uplinkshared channel belong.

(2) The terminal apparatus 1 according to the present invention is theterminal apparatus 1 which communicates with the base station apparatus3 and includes the subframe configuration unit 1013 that configures thefirst and second subframe sets; the number-of-modulation-symbolsdetermination unit 1071 b that determines the number of modulationsymbols for the channel state information transmitted on the physicaluplink shared channel based on the value of an offset; and thetransmission unit 107 that transmits the channel state information tothe base station apparatus 3 on the physical uplink shared channel. Thedetermination unit 107 configures a first value as the value of theoffset, and configures a second value as the value of the offset insteadof the first value if the subframe for transmission on the physicaluplink shared channel belong to the second subframe set.

(3) In the terminal apparatus 1 according to the embodiment, each of thefirst and second values may be configured based on a signal of thehigher layer.

(4) In the terminal apparatus 1 according to the embodiment, the channelstate information in the terminal apparatus may be the CQI and the PMI.

(5) In the terminal apparatus 1 according to the embodiment, the channelstate information may be the RI.

(6) The base station apparatus 3 according to the embodiment is the basestation apparatus 3 which communicates with the terminal apparatus 1 andincludes: the number-of-modulation-symbols specifying unit 3051 b thatcalculates the number of modulation symbols for the channel stateinformation received on the physical uplink shared channel based on thevalue of an offset; and the reception unit 305 that receives the channelstate information from the terminal apparatus 1 on the physical uplinkshared channel. When two subframe sets are configured by the higherlayers, the value of the offset is based on the subframe set to whichthe subframes for reception on the physical uplink shared channelbelong.

(7) The base station apparatus 3 according to the embodiment is the basestation apparatus 3 which communicates with the terminal apparatus 1 andincludes: the subframe configuration unit 3013 that configures first andsecond subframe sets; the number-of-modulation-symbols specifying unit3051 b that calculates the number of modulation symbols for the channelstate information received on the physical uplink shared channel basedon the value of an offset; and the reception unit 305 that receives thechannel state information from the terminal apparatus 1 on the physicaluplink shared channel. The calculation unit 305 configures a first valueas the value of the offset and configures a second value as the value ofthe offset instead of the first value if the subframe for reception onthe physical uplink shared channel belong to the second subframe set.

(8) In the base station apparatus 3 according to the embodiment, each ofthe first and second values may be configured based on a signal of ahigher layer.

(9) In the base station apparatus 3 according to the embodiment, thechannel state information may be the CQI and the PMI.

(10) In the base station apparatus 3 according to the embodiment, thechannel state information may be the RI.

A program operating in the base station apparatus 3 and the terminalapparatus 1 according to the present invention may be a program (aprogram enabling a computer to function) controlling a centralprocessing unit (CPU) or the like so that the functions of the foregoingembodiment of the present invention are realized. Information handled inthese apparatuses is temporarily stored in a random access memory (RAM)at the time of processing of the information. Thereafter, theinformation is stored in any of various read-only memories (ROMs) suchas a flash ROM or a hard disk drive (HDD), is read by the CPU, asnecessary, and is corrected and written.

Parts of the terminal apparatus 1 and the base station apparatus 3according to the above-described embodiment may be realized in acomputer. In this case, a program for realizing the control functionsmay be recorded in a computer-readable recording medium and the programrecorded in the recording medium may be read by a computer system to beexecuted so that the control functions are realized.

The “computer system” mentioned herein refers to a computer systemincluded in the terminal apparatus 1 or the base station apparatus 3 andis assumed to include an OS or hardware such as a peripheral device. The“computer-readable recording medium” refers to a portable medium such asa flexible disk, a magneto-optical disc, a ROM, or a CD-ROM or a storagedevice such as a hard disk included in the computer system.

Further, the “computer-readable recording medium” may include acommunication line that dynamically retains a program in a short timewhen a program is transmitted via the communication circuit, such as anetwork such as the Internet or a telephone line and a memory thatretains a program for a given time, such as a volatile memory in acomputer system serving as a server or a client in that case. Theprogram may be a program that realizes some of the above-describedfunctions or may be a program which further realizes the above-describedfunctions in combination with a program already recorded in the computersystem.

The base station apparatus 3 according to the above-described embodimentmay be realized as a collective (apparatus group) including a pluralityof apparatuses. Each of the apparatuses included in the apparatus groupmay have each function or some or all of the functional blocks of thebase station apparatus 3 according to the above-described embodiment.The apparatus group may have each function or each usual functionalblock of the base station apparatus 3. The terminal apparatus 1according to the above-described embodiment may also communicate withthe base station apparatus serving as the collective.

The base station apparatus 3 according to the above-described embodimentmay be an evolved universal terrestrial radio access network (EUTRAN).The base station apparatus 3 according to the above-described embodimentmay have some or all of the functions of an upper node with respect toan eNodeB.

Parts or the entireties of the terminal apparatus 1 and the base stationapparatus 3 according to the above-described embodiment may be generallyrealized as an LSI which is an integrated circuit or may be realized asa chip set. The functional blocks of the terminal apparatus 1 and thebase station apparatus 3 may be individually chipped or some or all ofthe functional blocks may be integrated and chipped. A method of formingan integrated circuit is not limited to an LSI, but a dedicated circuitor a general processor may be realized. When a technology for makingintegrated circuits in place of the LSI appears with advance insemiconductor technologies, an integrated circuit by this technology canalso be used.

In the above-described embodiment, the terminal apparatus has beendescribed as an example of a terminal apparatus or a communicationapparatus, but the present invention is not limited thereto. Theinvention can also be applied to terminal apparatuses or communicationapparatuses such as stationary or non-movable type electronicapparatuses installed indoors and outdoors, for example, AV apparatuses,kitchen apparatuses, cleaning and washing apparatuses, air conditioningapparatuses, office apparatuses, vending machines, and other livingapparatuses.

The embodiments of the present invention have been described in detailwith reference to the drawings, but specific configurations are notlimited to the embodiments. Modifications of design within the scope ofthe present invention without departing from the gist of the presentinvention are also included. The present invention can be modified invarious ways within the scope described in the claims and embodimentsobtained by appropriately combining technical means disclosed in otherembodiments are also included in the technical scope of the presentinvention. The elements described in the embodiments and obtaining thesame advantageous effects are substituted are also included.

DESCRIPTION OF REFERENCE NUMERALS

-   -   1 (1A, 1B, 1C) TERMINAL APPARATUS    -   3 BASE STATION APPARATUS    -   101 HIGHER LAYER PROCESSING UNIT    -   103 CONTROL UNIT    -   105 RECEPTION UNIT    -   107 TRANSMISSION UNIT    -   109 TRANSMISSION/RECEPTION ANTENNA    -   301 HIGHER LAYER PROCESSING UNIT    -   303 CONTROL UNIT    -   305 RECEPTION UNIT    -   307 TRANSMISSION UNIT    -   309 TRANSMISSION/RECEPTION ANTENNA    -   1011 RADIO SOURCE CONTROL UNIT    -   1013 SUBFRAME CONFIGURATION UNIT    -   1015 SCHEDULING INFORMATION INTERPRETATION UNIT    -   1017 CHANNEL STATE INFORMATION REPORT CONTROL UNIT    -   1051 DECODING UNIT    -   1053 DEMODULATION UNIT    -   1055 MULTIPLEX SEPARATION UNIT    -   1057 RADIO RECEPTION UNIT    -   1059 CHANNEL MEASUREMENT UNIT    -   1071 CODING UNIT    -   1071 a DATA CODING UNIT    -   1071 b NUMBER-OF-MODULATION-SYMBOLS DETERMINATION UNIT    -   1071 c CQI CODING UNIT    -   1071 d DATA CONTROL INFORMATION MULTIPLEXING UNIT    -   1071 e INTERLEAVING UNIT    -   1073 MODULATION UNIT    -   1075 MULTIPLEXING UNIT    -   1077 RADIO TRANSMISSION UNIT    -   1079 UPLINK REFERENCE SIGNAL GENERATION UNIT    -   3011 RADIO RESOURCE CONTROL UNIT    -   3013 SUBFRAME CONFIGURATION UNIT    -   3015 SCHEDULING UNIT    -   3017 CHANNEL STATE INFORMATION REPORT CONTROL UNIT    -   3051 DECODING UNIT    -   3051 a DE-INTERLEAVING UNIT    -   3051 b NUMBER-OF-MODULATION-SYMBOLS SPECIFYING UNIT    -   3051 c DATA CONTROL INFORMATION SEPARATION UNIT    -   3051 d DATA DECODING UNIT    -   3051 e CQI DECODING UNIT    -   3053 DEMODULATION UNIT    -   3055 MULTIPLEX SEPARATION UNIT    -   3057 RADIO RECEPTION UNIT    -   3059 CHANNEL MEASUREMENT UNIT    -   3071 CODING UNIT    -   3073 MODULATION UNIT    -   3075 MULTIPLEXING UNIT    -   3077 RADIO TRANSMISSION UNIT    -   3079 DOWNLINK REFERENCE SIGNAL GENERATION UNIT

1. A terminal apparatus comprising: reception circuitry configured toreceive a higher layer message configuring a set of values and receivesdownlink control information on a physical downlink control channel;determination circuitry configured to determine an offset value from theset of values based on a field value in the downlink control informationand a number of modulation coded symbols for channel state informationbased on the offset value; and transmission circuitry configured totransmit the channel state information on a physical uplink sharedchannel.
 2. The terminal apparatus according to claim 1, wherein thefield value indicates a value from the set of values as the offsetvalue.
 3. A base station apparatus comprising: transmission circuitryconfigured to transmit a higher layer message configuring a set ofvalues and transmits downlink control information on a physical downlinkcontrol channel; and reception circuitry configured to receive channelstate information on a physical uplink shared channel, wherein an offsetvalue is determined from the set of values based on a field value in thedownlink control information, and a number of modulation coded symbolsfor the channel state information is determined based on the offsetvalue.
 4. The base station apparatus according to claim 3, wherein thefield value indicates a value from the set of values as the offsetvalue.
 5. A communication method for a terminal apparatus, comprising:receiving a higher layer message configuring a set of values andreceives downlink control information on a physical downlink controlchannel; determining an offset value from the set of values based on afield value in the downlink control information and a number ofmodulation coded symbols for channel state information based on theoffset value; and transmitting the channel state information on aphysical uplink shared channel.
 6. The communication method according toclaim 5, wherein the field value indicates a value from the set ofvalues as the offset value.
 7. A communication method for a base stationapparatus, comprising: transmitting a higher layer message configuring aset of values and transmits downlink control information on a physicaldownlink control channel; and receiving channel state information on aphysical uplink shared channel, wherein an offset value is determinedfrom the set of values based on a field value in the downlink controlinformation, and a number of modulation coded symbols for the channelstate information is determined based on the offset value.
 8. Thecommunication method according to claim 7, wherein the field valueindicates a value from the set of values as the offset value.